diff --git a/messages/v1/messages/config.configuration.server.get.yml b/messages/v1/messages/config.configuration.server.get.yml
index 02c4b67..8305ed1 100644
--- a/messages/v1/messages/config.configuration.server.get.yml
+++ b/messages/v1/messages/config.configuration.server.get.yml
@@ -18,9 +18,10 @@ parameters:
     ref: Server.ServerId
     description: |
       Identifiant du serveur.
-  deploy:
+  deployed:
     type: Boolean
     description: Configuration de type déployée.
+    default: true
 
 response:
   type: ConfigConfiguration
diff --git a/messages/v1/messages/config.configuration.server.updated.yml b/messages/v1/messages/config.configuration.server.updated.yml
index 66f3952..65f38f3 100644
--- a/messages/v1/messages/config.configuration.server.updated.yml
+++ b/messages/v1/messages/config.configuration.server.updated.yml
@@ -17,6 +17,6 @@ parameters:
     type: Number
     description: |
       Identifiant du serveur.
-  deploy:
+  deployed:
     type: Boolean
     description: Configuration de type déployée.
diff --git a/messages/v1/messages/servermodel.created.yml b/messages/v1/messages/servermodel.created.yml
index e180b78..90d55c4 100644
--- a/messages/v1/messages/servermodel.created.yml
+++ b/messages/v1/messages/servermodel.created.yml
@@ -10,6 +10,5 @@ public: false
 domain: servermodel-domain
 
 parameters:
-  servermodels:
-    type: '[]Servermodel'
-    description: Informations sur les modèles de serveur créés.
+  type: Servermodel
+  description: Informations sur les modèles de serveur créés.
diff --git a/messages/v1/messages/servermodel.updated.yml b/messages/v1/messages/servermodel.updated.yml
index 46af1fe..531c18e 100644
--- a/messages/v1/messages/servermodel.updated.yml
+++ b/messages/v1/messages/servermodel.updated.yml
@@ -10,6 +10,5 @@ public: false
 domain: servermodel-domain
 
 parameters:
-  servermodels:
-    type: '[]Servermodel'
-    description: Informations sur les modèles de serveur modifiés.
+  type: 'Servermodel'
+  description: Informations sur les modèles de serveur modifiés.
diff --git a/messages/v1/messages/session.server.get.yml b/messages/v1/messages/session.server.get.yml
index 3484914..33dc568 100644
--- a/messages/v1/messages/session.server.get.yml
+++ b/messages/v1/messages/session.server.get.yml
@@ -2,7 +2,7 @@
 uri: session.server.get
 
 description: |
-  Configure le server.
+  Récupérer la configuration du server.
 
 pattern: rpc
 
@@ -16,6 +16,11 @@ parameters:
     ref: Config.SessionId
     shortarg: s
     description: Identifiant de la configuration.
+  name:
+    type: String
+    shortarg: n
+    description: Nom de la variable.
+    default: null
 
 response:
   type: Session
diff --git a/messages/v1/messages/session.server.validate.yml b/messages/v1/messages/session.server.validate.yml
index 81134c6..383312c 100644
--- a/messages/v1/messages/session.server.validate.yml
+++ b/messages/v1/messages/session.server.validate.yml
@@ -18,6 +18,6 @@ parameters:
     description: Identifiant de la session.
 
 response:
-  type: SessionConfigurationStatus
+  type: Session
   description: Statut de la configuration.
 
diff --git a/messages/v1/messages/session.servermodel.get.yml b/messages/v1/messages/session.servermodel.get.yml
index c22cd9b..aac98a8 100644
--- a/messages/v1/messages/session.servermodel.get.yml
+++ b/messages/v1/messages/session.servermodel.get.yml
@@ -16,6 +16,11 @@ parameters:
     ref: Config.SessionId
     shortarg: s
     description: Identifiant de la configuration.
+  name:
+    type: String
+    shortarg: n
+    description: Nom de la variable.
+    default: null
 
 response:
   type: Session
diff --git a/messages/v1/messages/session.servermodel.validate.yml b/messages/v1/messages/session.servermodel.validate.yml
index 7d3e25d..1fe0078 100644
--- a/messages/v1/messages/session.servermodel.validate.yml
+++ b/messages/v1/messages/session.servermodel.validate.yml
@@ -18,6 +18,6 @@ parameters:
     description: Identifiant de la session.
 
 response:
-  type: SessionConfigurationStatus
+  type: Session
   description: Statut de la configuration.
 
diff --git a/messages/v1/types/config.configuration.yml b/messages/v1/types/config.configuration.yml
index 05aaee5..fbd26e7 100644
--- a/messages/v1/types/config.configuration.yml
+++ b/messages/v1/types/config.configuration.yml
@@ -3,8 +3,15 @@ title: ConfigConfiguration
 type: object
 description: Description de la configuration.
 properties:
+  server_id:
+    type: number
+    description: Identifiant du serveur.
+    ref: Server.ServerId
+  deployed:
+    type: boolean
+    description: La configuration est déployée.
   configuration:
-    type: File
+    type: object
     description: Détail de la configuration au format JSON.
 required:
   - configuration
diff --git a/messages/v1/types/servermodel.yml b/messages/v1/types/servermodel.yml
index 1d2ff34..c963f44 100644
--- a/messages/v1/types/servermodel.yml
+++ b/messages/v1/types/servermodel.yml
@@ -37,16 +37,16 @@ properties:
       type: object
     description: Liste des services applicatifs déclarés pour ce modèle de serveur.
   schema:
-    type: File
+    type: string
     description: Contenu du schema.
   probes:
-    type: File
+    type: string
     description: Informations sur les sondes.
   creolefuncs:
-    type: File
+    type: string
     description: Fonctions Creole.
   conffiles:
-    type: File
+    type: string
     description: Fichiers creole au format tar encodé base64
 required:
   - servermodelid
diff --git a/messages/v1/types/session.configuration.status.yml b/messages/v1/types/session.configuration.status.yml
deleted file mode 100644
index d84c3e2..0000000
--- a/messages/v1/types/session.configuration.status.yml
+++ /dev/null
@@ -1,24 +0,0 @@
----
-title: SessionConfigurationStatus
-type: object
-description: Statut de la configuration.
-properties:
-  session_id:
-    type: string
-    description: ID de la session.
-    ref: Config.SessionId
-  status:
-    type: string
-    description: Statut de la configuration (peut être ok, error, incomplete)
-  message:
-    type: string
-    description: Message d'erreur si la configuration a le statut error.
-  mandatories:
-    type: array
-    items:
-      type: string
-    description: Liste des variables obligatoires non renseignées si la configuration a le statut incomplete.
-required:
-  - session_id
-  - status
-
diff --git a/messages/v1/types/session.status.yml b/messages/v1/types/session.status.yml
index cdad2ad..bb3497d 100644
--- a/messages/v1/types/session.status.yml
+++ b/messages/v1/types/session.status.yml
@@ -12,9 +12,6 @@ properties:
   index:
     type: number
     description: Index de la variable a modifier.
-  status:
-    type: string
-    description: Status de la modification.
   message:
     type: string
     description: Message d'erreur.
diff --git a/messages/v1/types/session.yml b/messages/v1/types/session.yml
index 0641515..62f4d56 100644
--- a/messages/v1/types/session.yml
+++ b/messages/v1/types/session.yml
@@ -27,7 +27,7 @@ properties:
     type: boolean
     description: La configuration est en mode debug.
   content:
-    type: file
+    type: object
     description: Contenu de la configuration.
 required:
   - session_id
diff --git a/src/risotto/__init__.py b/src/risotto/__init__.py
index 6b111a1..0c67d85 100644
--- a/src/risotto/__init__.py
+++ b/src/risotto/__init__.py
@@ -1,6 +1,4 @@
 from .http import get_app
-# just to register every route
-from . import services as _services
 
 __ALL__ = ('get_app',)
 
diff --git a/src/risotto/config.py b/src/risotto/config.py
index e6b8b8e..0ecd5b0 100644
--- a/src/risotto/config.py
+++ b/src/risotto/config.py
@@ -1,7 +1,7 @@
 HTTP_PORT = 8080
 MESSAGE_ROOT_PATH = 'messages'
 ROOT_CACHE_DIR = 'cache'
-DEBUG = True
+DEBUG = False
 DATABASE_DIR = 'database'
 INTERNAL_USER = 'internal'
 CONFIGURATION_DIR = 'configurations'
diff --git a/src/risotto/dispatcher.py b/src/risotto/dispatcher.py
index 112a343..3bc5737 100644
--- a/src/risotto/dispatcher.py
+++ b/src/risotto/dispatcher.py
@@ -149,7 +149,7 @@ class PublishDispatcher:
             return
 
         # config is ok, so publish the message
-        for function_obj in self.messages[version][message]['functions']:
+        for function_obj in self.messages[version][message].get('functions', []):
             function = function_obj['function']
             module_name = function.__module__.split('.')[-2]
             function_name = function.__name__
@@ -163,21 +163,21 @@ class PublishDispatcher:
                 if function_obj['risotto_context']:
                     kw['risotto_context'] = risotto_context
                 # send event
-                await function(self.injected_self[function_obj['module']], **kw)
+                returns = await function(self.injected_self[function_obj['module']], **kw)
             except Exception as err:
                 if DEBUG:
                     print_exc()
                 log.error_msg(risotto_context, kwargs, err, info_msg)
+                continue
             else:
                 log.info_msg(risotto_context, kwargs, info_msg)
-
-        # notification
-        if obj.get('notification'):
-            notif_version, notif_message = obj['notification'].split('.', 1)
-            await self.publish(notif_version,
-                               notif_message,
-                               risotto_context,
-                               **returns)
+            # notification
+            if function_obj.get('notification'):
+                notif_version, notif_message = function_obj['notification'].split('.', 1)
+                await self.publish(notif_version,
+                                   notif_message,
+                                   risotto_context,
+                                   **returns)
 
 
 class Dispatcher(register.RegisterDispatcher, CallDispatcher, PublishDispatcher):
diff --git a/src/risotto/http.py b/src/risotto/http.py
index 74dbda1..55db445 100644
--- a/src/risotto/http.py
+++ b/src/risotto/http.py
@@ -1,6 +1,9 @@
 from aiohttp.web import Application, Response, get, post, HTTPBadRequest, HTTPInternalServerError, HTTPNotFound
-from tiramisu import Config
 from json import dumps
+from traceback import print_exc
+from tiramisu import Config
+
+
 from .dispatcher import dispatcher
 from .utils import _
 from .context import Context
@@ -8,7 +11,7 @@ from .error import CallError, NotAllowedError, RegistrationError
 from .message import get_messages
 from .logger import log
 from .config import DEBUG, HTTP_PORT
-from traceback import print_exc
+from .services import load_services
 
 
 def create_context(request):
@@ -96,6 +99,7 @@ async def get_app(loop):
     """ build all routes
     """
     global extra_routes
+    load_services()
     app = Application(loop=loop)
     routes = []
     for version, messages in dispatcher.messages.items():
diff --git a/src/risotto/logger.py b/src/risotto/logger.py
index 2dd1f8d..b8f1655 100644
--- a/src/risotto/logger.py
+++ b/src/risotto/logger.py
@@ -1,6 +1,7 @@
 from typing import Dict
 from .context import Context
 from .utils import _
+from .config import DEBUG
 
 
 class Logger:
@@ -30,6 +31,7 @@ class Logger:
         """ send message when an error append
         """
         paths_msg = self._get_message_paths(risotto_context)
+        # if DEBUG:
         print(_(f'{risotto_context.username}: ERROR: {error} ({paths_msg} with arguments "{arguments}": {msg})'))
 
     def info_msg(self,
@@ -48,7 +50,8 @@ class Logger:
         if msg:
             tmsg += f' {msg}'
 
-        print(tmsg)
+        if DEBUG:
+            print(tmsg)
 
 
 log = Logger()
diff --git a/src/risotto/register.py b/src/risotto/register.py
index 8c28172..1248fa7 100644
--- a/src/risotto/register.py
+++ b/src/risotto/register.py
@@ -209,10 +209,10 @@ class RegisterDispatcher:
             self.messages[version][message]['functions'] = []
 
         dico = {'module': module_name,
-                'functions': function,
+                'function': function,
                 'arguments': function_args,
                 'risotto_context': inject_risotto_context}
-        if notification:
+        if notification and notification is not undefined:
             dico['notification'] = notification
         self.messages[version][message]['functions'].append(dico)
 
diff --git a/src/risotto/services/__init__.py b/src/risotto/services/__init__.py
index 2c0f6cc..a9be627 100644
--- a/src/risotto/services/__init__.py
+++ b/src/risotto/services/__init__.py
@@ -4,15 +4,16 @@ from importlib import import_module
 from ..dispatcher import dispatcher
 
 
-def list_import():
+def load_services(modules=None,
+                  validate: bool=True):
     abs_here = dirname(abspath(__file__))
     here = basename(abs_here)
     module = basename(dirname(abs_here))
-    for filename in listdir(abs_here):
+    if not modules:
+        modules = listdir(abs_here)
+    for filename in modules:
         absfilename = join(abs_here, filename)
         if isdir(absfilename) and isfile(join(absfilename, '__init__.py')):
             dispatcher.set_module(filename, import_module(f'.{here}.{filename}', module))
-    dispatcher.validate()
-
-
-list_import()
+    if validate:
+        dispatcher.validate()
diff --git a/src/risotto/services/config/config.py b/src/risotto/services/config/config.py
index cea5a67..673e9d4 100644
--- a/src/risotto/services/config/config.py
+++ b/src/risotto/services/config/config.py
@@ -1,9 +1,9 @@
 from lxml.etree import parse
 from io import BytesIO
+from os import unlink
 from os.path import isdir, isfile, join
 from traceback import print_exc
-from json import dumps
-from typing import Dict
+from typing import Dict, List
 
 from tiramisu import Storage, delete_session, MetaConfig, MixConfig
 from rougail import load as rougail_load
@@ -22,7 +22,7 @@ class Risotto(Controller):
     server = {}
 
     def __init__(self) -> None:
-        for dirname in [ROOT_CACHE_DIR, DATABASE_DIR, ROUGAIL_DTD_PATH]:
+        for dirname in [ROOT_CACHE_DIR, DATABASE_DIR]:
             if not isdir(dirname):
                 raise RegistrationError(_(f'unable to find the cache dir "{dirname}"'))
         self.save_storage = Storage(engine='sqlite3', dir_database=DATABASE_DIR)
@@ -58,7 +58,8 @@ class Risotto(Controller):
         for servermodel in servermodels:
             if 'servermodelparentsid' in servermodel:
                 for servermodelparentid in servermodel['servermodelparentsid']:
-                    self.servermodel_legacy(servermodel['servermodelname'],
+                    self.servermodel_legacy(risotto_context,
+                                            servermodel['servermodelname'],
                                             servermodel['servermodelid'],
                                             servermodelparentid)
 
@@ -156,6 +157,7 @@ class Risotto(Controller):
         return metaconfig
 
     def servermodel_legacy(self,
+                           risotto_context: Context,
                            servermodel_name: str,
                            servermodel_id: int,
                            servermodel_parent_id: int) -> None:
@@ -284,99 +286,106 @@ class Risotto(Controller):
     async def server_deleted(self,
                              server_id: int) -> None:
         # delete config to it's parents
-        for config in self.server[server_id].values():
+        for server_type in ['server', 'server_to_deploy']:
+            config = self.server[server_id]['server']
             for parent in config.config.parents():
                 parent.config.pop(config.config.name())
-                delete_session(config.config.name())
+                delete_session(storage=self.save_storage,
+                               session_id=config.config.name())
         # delete metaconfig
         del self.server[server_id]
 
     @register('v1.servermodel.created')
     async def servermodel_created(self,
-                                  servermodels) -> None:
+                                  risotto_context: Context,
+                                  servermodelid: int,
+                                  servermodelname: str,
+                                  servermodelparentsid: List[int]) -> None:
         """ when servermodels are created, load it and do link
         """
-        for servermodel in servermodels:
-            await self.load_servermodel(servermodel['servermodelid'], servermodel['servermodelname'])
-        for servermodel in servermodels:
-            if 'servermodelparentsid' in servermodel:
-                for servermodelparentid in servermodel['servermodelparentsid']:
-                    self.servermodel_legacy(servermodel['servermodelname'], servermodel['servermodelid'], servermodelparentid)
+        await self.load_and_link_servermodel(risotto_context,
+                                             servermodelid,
+                                             servermodelname,
+                                             servermodelparentsid)
+
+
+    async def load_and_link_servermodel(self,
+                                        risotto_context: Context,
+                                        servermodelid: int,
+                                        servermodelname: str,
+                                        servermodelparentsid: List[int]) -> None:
+        await self.load_servermodel(risotto_context,
+                                    servermodelid,
+                                    servermodelname)
+        if servermodelparentsid is not None:
+            for servermodelparentid in servermodelparentsid:
+                self.servermodel_legacy(risotto_context,
+                                        servermodelname,
+                                        servermodelid,
+                                        servermodelparentid)
+
+    def servermodel_delete(self,
+                           servermodelid: int) -> List[MetaConfig]:
+        metaconfig = self.servermodel.pop(servermodelid)
+        mixconfig = next(metaconfig.config.list())
+        children = []
+        for child in mixconfig.config.list():
+            children.append(child)
+            mixconfig.config.pop(child.config.name())
+        metaconfig.config.pop(mixconfig.config.name())
+        delete_session(storage=self.save_storage,
+                       session_id=mixconfig.config.name())
+        del mixconfig
+        for parent in metaconfig.config.parents():
+            parent.config.pop(metaconfig.config.name())
+        delete_session(storage=self.save_storage,
+                       session_id=metaconfig.config.name())
+        return children
 
     @register('v1.servermodel.updated')
     async def servermodel_updated(self,
                                   risotto_context: Context,
-                                  servermodels) -> None:
-        for servermodel in servermodels:
-            servermodelid = servermodel['servermodelid']
-            servermodelname = servermodel['servermodelname']
-            servermodelparentsid = servermodel.get('servermodelparentsid')
-            log.info_msg(risotto_context,
-                         None,
-                         f'Reload servermodel {servermodelname} ({servermodelid})')
-            # unlink cache to force download new aggregated file
-            cache_file = join(ROOT_CACHE_DIR, str(servermodelid)+".xml")
-            if isfile(cache_file):
-                unlink(cache_file)
+                                  servermodelid: int,
+                                  servermodelname: str,
+                                  servermodelparentsid: List[int]) -> None:
+        log.info_msg(risotto_context,
+                     None,
+                     f'Reload servermodel {servermodelname} ({servermodelid})')
+        # unlink cache to force download new aggregated file
+        cache_file = join(ROOT_CACHE_DIR, str(servermodelid)+".xml")
+        if isfile(cache_file):
+            unlink(cache_file)
 
-            # get current servermodel
-            old_servermodel = self.servermodel[servermodelid]
+        # store all informations
+        if servermodelid in self.servermodel:
+            old_values = self.servermodel[servermodelid].value.exportation()
+            old_permissives = self.servermodel[servermodelid].permissive.exportation()
+            old_properties = self.servermodel[servermodelid].property.exportation()
+            children = self.servermodel_delete(servermodelid)
+        else:
+            old_values = None
 
-            # create new one
-            await self.load_servermodel(servermodelid, servermodelname)
+        # create new one
+        await self.load_and_link_servermodel(risotto_context,
+                                             servermodelid,
+                                             servermodelname,
+                                             servermodelparentsid)
 
-            # migrate all informations
-            self.servermodel[servermodelid].value.importation(old_servermodel.value.exportation())
-            self.servermodel[servermodelid].permissive.importation(old_servermodel.permissive.exportation())
-            self.servermodel[servermodelid].property.importation(old_servermodel.property.exportation())
-
-            # remove link to legacy
-            if servermodelparentsid:
-                for servermodelparentid in servermodelparentsid:
-                    mix = self.servermodel[servermodelparentid].config.get('m_v_' + str(servermodelparentid))
-                    try:
-                        mix.config.pop(old_servermodel.config.name())
-                    except:
-                        # if mix config is reloaded too
-                        pass
-                    # add new link
-                    self.servermodel_legacy(servermodelname, servermodelid, servermodelparentid)
-
-            # reload servers or servermodels in servermodel
-            for subconfig in old_servermodel.config.list():
-                if not isinstance(subconfig, MixConfig):
-                    # a server
-                    name = subconfig.config.name()
-                    if name.startswith('str_'):
-                        continue
-                    server_id = subconfig.information.get('server_id')
-                    server_name = subconfig.information.get('server_name')
-                    try:
-                        old_servermodel.config.pop(name)
-                        old_servermodel.config.pop(f'std_{server_id}')
-                    except:
-                        pass
-                    del self.server[server_id]
-                    self.load_server(risotto_context, 
-                                     server_id,
-                                     server_name,
-                                     servermodelid)
-                else:
-                    # a servermodel
-                    for subsubconfig in subconfig.config.list():
-                        name = subsubconfig.config.name()
-                        try:
-                            subconfig.config.pop(name)
-                        except:
-                            pass
-                        self.servermodel_legacy(subsubconfig.information.get('servermodel_name'),
-                                                subsubconfig.information.get('servermodel_id'),
-                                                servermodelid)
+        # migrates informations
+        if old_values is not None:
+            self.servermodel[servermodelid].value.importation(old_values)
+            self.servermodel[servermodelid].permissive.importation(old_permissives)
+            self.servermodel[servermodelid].property.importation(old_properties)
+            for child in children:
+                self.servermodel_legacy(risotto_context,
+                                        child.information.get('servermodel_name'),
+                                        child.information.get('servermodel_id'),
+                                        servermodelid)
 
     @register('v1.config.configuration.server.get', None)
     async def get_configuration(self,
                                 server_id: int,
-                                deploy: bool) -> bytes:
+                                deployed: bool) -> bytes:
         if server_id not in self.server:
             msg = _(f'cannot find server with id {server_id}')
             log.error_msg(risotto_context,
@@ -384,16 +393,16 @@ class Risotto(Controller):
                           msg)
             raise CallError(msg)
 
-        if deploy:
+        if deployed:
             server = self.server[server_id]['server']
         else:
             server = self.server[server_id]['server_to_deploy']
 
         server.property.read_only()
         try:
-            dico = server.value.dict(fullpath=True)
+            configuration = server.value.dict(fullpath=True)
         except:
-            if deploy:
+            if deployed:
                 msg = _(f'No configuration available for server {server_id}')
             else:
                 msg = _(f'No undeployed configuration available for server {server_id}')
@@ -401,8 +410,9 @@ class Risotto(Controller):
                           None,
                           msg)
             raise CallError(msg)
-        return dumps(dico).encode()
-
+        return {'server_id': server_id,
+                'deployed': deployed,
+                'configuration': configuration}
 
     @register('v1.config.configuration.server.deploy', 'v1.config.configuration.server.updated')
     async def deploy_configuration(self,
@@ -428,4 +438,4 @@ class Risotto(Controller):
         config.property.importation(config_std.property.exportation())
 
         return {'server_id': server_id,
-                'deploy': True}
+                'deployed': True}
diff --git a/src/risotto/services/session/session.py b/src/risotto/services/session/session.py
index 8383d95..7b24f4d 100644
--- a/src/risotto/services/session/session.py
+++ b/src/risotto/services/session/session.py
@@ -1,7 +1,6 @@
 from os import urandom  # , unlink
 from binascii import hexlify
 from traceback import print_exc
-from json import dumps
 from typing import Dict, List, Optional, Any
 from tiramisu import Storage
 
@@ -28,6 +27,7 @@ class Risotto(Controller):
         return storage_servermodel
 
     def get_session(self,
+                    risotto_context: Context,
                     session_id: str,
                     type: str) -> Dict:
         """ Get session information from storage
@@ -36,7 +36,8 @@ class Risotto(Controller):
             storage = storage_server
         else:
             storage = storage_servermodel
-        return storage.get_session(session_id)
+        return storage.get_session(session_id,
+                                   risotto_context.username)
 
     def get_session_informations(self,
                                  risotto_context: Context,
@@ -44,9 +45,9 @@ class Risotto(Controller):
                                  type: str) -> Dict:
         """ format session with a session ID name
         """
-        session = self.get_session(session_id,
-                                   type,
-                                   risotto_context.username)
+        session = self.get_session(risotto_context,
+                                   session_id,
+                                   type)
         return self.format_session(session_id,
                                    session)
 
@@ -104,16 +105,16 @@ class Risotto(Controller):
                             self.modify_storage)
 
         # return session's information
-        return self.get_session_informations(session_id,
+        return self.get_session_informations(risotto_context,
+                                             session_id,
                                              type)
 
     @register(['v1.session.server.list', 'v1.session.servermodel.list'], None)
     async def list_session_server(self,
                                   risotto_context: Context) -> Dict:
         type = risotto_context.message.rsplit('.', 2)[-2]
-        storage = self.get_storage(type,
-                                   risotto_context.username)
-        return [self.format_session(session_id, session) or session_id, session in storage.get_sessions().items()]
+        storage = self.get_storage(type)
+        return [self.format_session(session_id, session) for session_id, session in storage.get_sessions().items()]
 
 
     @register(['v1.session.server.filter', 'v1.session.servermodel.filter'], None)
@@ -127,7 +128,7 @@ class Risotto(Controller):
         storage = self.get_storage(type)
         # to validate the session right
         storage.get_session(session_id,
-                            username)
+                            risotto_context.username)
         if namespace is not None:
             storage.set_namespace(session_id,
                                   namespace)
@@ -139,7 +140,8 @@ class Risotto(Controller):
         if debug is not None:
             storage.set_config_debug(session_id,
                                      debug)
-        return self.get_session_informations(session_id,
+        return self.get_session_informations(risotto_context,
+                                             session_id,
                                              type)
 
     @register(['v1.session.server.configure', 'v1.session.servermodel.configure'], None)
@@ -152,25 +154,25 @@ class Risotto(Controller):
                                 value: Any,
                                 value_multi: Optional[List]) -> Dict:
         type = risotto_context.message.rsplit('.', 2)[-2]
-        session = self.get_session(session_id,
-                                   type,
-                                   risotto_context.username)
+        session = self.get_session(risotto_context,
+                                   session_id,
+                                   type)
         # if multi and not follower the value is in fact in value_multi
-        option = session['config'].option(name).option
+        option = session['option'].option(name).option
         if option.ismulti() and not option.isfollower():
             value = value_multi
-        try:
-            update = {'name': name,
-                      'action': action,
-                      'value': value}
-            if index is not None:
-                update['index'] = index
-            updates = {'updates': [update]}
-            session['option'].updates(updates)
-        except Exception as err:
-            if DEBUG:
-                print_exc()
-            raise CallError(str(err))
+        namespace = session['namespace']
+        update = {'name': f'{namespace}.{name}',
+                  'action': action,
+                  'value': value}
+        if index is not None:
+            update['index'] = index
+        updates = {'updates': [update]}
+        ret = session['option'].updates(updates)
+        if update['name'] in ret:
+            for val in ret[update['name']][index]:
+                if isinstance(val, ValueError):
+                    raise CallError(val)
         ret = {'session_id': session_id,
                'name': name}
         if index is not None:
@@ -182,9 +184,9 @@ class Risotto(Controller):
                                risotto_context: Context,
                                session_id: str) -> Dict:
         type = risotto_context.message.rsplit('.', 2)[-2]
-        session = self.get_session(session_id,
-                                   type,
-                                   risotto_context.username)
+        session = self.get_session(risotto_context,
+                                   session_id,
+                                   type)
         try:
             session['config'].forcepermissive.option(session['namespace']).value.dict()
         except Exception as err:
@@ -205,13 +207,17 @@ class Risotto(Controller):
     @register(['v1.session.server.get', 'v1.session.servermodel.get'], None)
     async def get_session_server(self,
                                  risotto_context: Context,
-                                 session_id: str) -> Dict:
+                                 session_id: str,
+                                 name: Optional[str]) -> Dict:
         type = risotto_context.message.rsplit('.', 2)[-2]
-        session = self.get_session(session_id,
-                                   type,
-                                   risotto_context.username)
+        session = self.get_session(risotto_context,
+                                   session_id,
+                                   type)
         info = self.format_session(session_id, session)
-        info['content'] = dumps(session['option'].value.dict(fullpath=True))
+        if name is not None:
+            info['content'] = {name: session['option'].option(name).value.get()}
+        else:
+            info['content'] = session['option'].value.dict()
         return info
 
     @register(['v1.session.server.stop', 'v1.session.servermodel.stop'], None)
diff --git a/src/risotto/services/session/storage.py b/src/risotto/services/session/storage.py
index a320209..bdb6b0b 100644
--- a/src/risotto/services/session/storage.py
+++ b/src/risotto/services/session/storage.py
@@ -66,7 +66,7 @@ class Storage(object):
                         mode: str):
         """ Define which edition mode to select
         """
-        config = self.session[id]['config']
+        config = self.sessions[id]['config']
         for mode_level in modes.values():
             if modes[mode] < mode_level:
                 config.property.add(mode_level.name)
@@ -77,7 +77,7 @@ class Storage(object):
     def set_config_debug(self, id_, is_debug):
         """ Enable/Disable debug mode
         """
-        config = self.session[id_]['config']
+        config = self.sessions[id_]['config']
         if is_debug:
             config.property.pop('hidden')
         else:
@@ -94,13 +94,14 @@ class Storage(object):
         return self.sessions;
 
     def get_session(self,
-                    id: int,
+                    session_id: int,
                     username: str) -> Dict:
-        if id not in self.sessions:
+        if session_id not in self.sessions:
             raise Exception(f'the session {id} not exists')
-        if username != storage.get_session(session_id)['username']:
+        session = self.sessions[session_id]
+        if username != session['username']:
             raise NotAllowedError()
-        return self.sessions[id]
+        return session
 
     def del_session(self,
                     id: int):
diff --git a/tests/test_config.py b/tests/test_config.py
index 6f818b1..f788010 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -13,7 +13,6 @@ def setup_module(module):
                   validate=False)
     config_module = dispatcher.get_service('config')
     config_module.save_storage = Storage(engine='sqlite3', dir_database=DATABASE_DIR, name='test')
-    config_module.save_persistent = False
     dispatcher.set_module('server', import_module(f'.server', 'fake_services'))
     dispatcher.set_module('servermodel', import_module(f'.servermodel', 'fake_services'))
 
diff --git a/tests/test_session.py b/tests/test_session.py
new file mode 100644
index 0000000..64c403a
--- /dev/null
+++ b/tests/test_session.py
@@ -0,0 +1,501 @@
+from importlib import import_module
+import pytest
+from tiramisu import Storage
+from risotto.context import Context
+from risotto.services import load_services
+from risotto.dispatcher import dispatcher
+from risotto.config import DATABASE_DIR
+from risotto.services.session.storage import  storage_server, storage_servermodel
+
+
+def get_fake_context(module_name):
+    risotto_context = Context()
+    risotto_context.username = 'test'
+    risotto_context.paths.append(f'{module_name}.on_join')
+    risotto_context.type = None
+    return risotto_context
+
+
+def setup_module(module):
+    load_services(['config', 'session'],
+                  validate=False)
+    config_module = dispatcher.get_service('config')
+    config_module.save_storage = Storage(engine='sqlite3', dir_database=DATABASE_DIR, name='test')
+    dispatcher.set_module('server', import_module(f'.server', 'fake_services'))
+    dispatcher.set_module('servermodel', import_module(f'.servermodel', 'fake_services'))
+
+
+def teardown_function(function):
+    config_module = dispatcher.get_service('session')
+    storage_server.sessions = {}
+    storage_servermodel.sessions = {}
+
+
+@pytest.mark.asyncio
+async def test_server_start():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    await dispatcher.call('v1', 
+                          'session.server.start',
+                          fake_context,
+                          id=3)
+
+
+@pytest.mark.asyncio
+async def test_server_list():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    assert not await dispatcher.call('v1', 
+                                     'session.server.list',
+                                     fake_context)
+    await dispatcher.call('v1', 
+                          'session.server.start',
+                          fake_context,
+                          id=3)
+    assert await dispatcher.call('v1', 
+                                 'session.server.list',
+                                 fake_context)
+
+
+@pytest.mark.asyncio
+async def test_server_filter_namespace():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.server.start',
+                                    fake_context,
+                                    id=3)
+    session_id = session['session_id']
+    namespace = 'containers'
+    await dispatcher.call('v1',
+                          'session.server.filter',
+                          fake_context,
+                          session_id=session_id,
+                          namespace=namespace)
+    list_result = await dispatcher.call('v1', 
+                                        'session.server.list',
+                                        fake_context)
+    assert list_result[0]['namespace'] == namespace
+
+
+@pytest.mark.asyncio
+async def test_server_filter_mode():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.server.start',
+                                    fake_context,
+                                    id=3)
+    session_id = session['session_id']
+    assert session['mode'] == 'normal'
+    mode = 'expert'
+    await dispatcher.call('v1',
+                          'session.server.filter',
+                          fake_context,
+                          session_id=session_id,
+                          mode=mode)
+    list_result = await dispatcher.call('v1', 
+                                        'session.server.list',
+                                        fake_context)
+    assert list_result[0]['mode'] == mode
+
+
+@pytest.mark.asyncio
+async def test_server_filter_debug():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.server.start',
+                                    fake_context,
+                                    id=3)
+    session_id = session['session_id']
+    assert session['debug'] == False
+    debug = True
+    await dispatcher.call('v1',
+                          'session.server.filter',
+                          fake_context,
+                          session_id=session_id,
+                          debug=debug)
+    list_result = await dispatcher.call('v1', 
+                                        'session.server.list',
+                                        fake_context)
+    assert list_result[0]['debug'] == debug
+#FIXME
+
+
+@pytest.mark.asyncio
+async def test_server_filter_get():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.server.start',
+                                    fake_context,
+                                    id=3)
+    session_id = session['session_id']
+    values = await dispatcher.call('v1',
+                                   'session.server.get',
+                                   fake_context,
+                                   session_id=session_id)
+    assert values == {'content': {"general.mode_conteneur_actif": "non",
+                                  "general.master.master": [],
+                                  "general.master.slave1": [],
+                                  "general.master.slave2": []},
+                       'debug': False,
+                       'id': 3,
+                       'mode': 'normal',
+                       'namespace': 'creole',
+                       'session_id': session_id,
+                       'timestamp': values['timestamp'],
+                       'username': 'test'}
+
+
+@pytest.mark.asyncio
+async def test_server_filter_get_one_value():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.server.start',
+                                    fake_context,
+                                    id=3)
+    session_id = session['session_id']
+    values = await dispatcher.call('v1',
+                                   'session.server.get',
+                                   fake_context,
+                                   session_id=session_id,
+                                   name="general.mode_conteneur_actif")
+    assert values == {'content': {"general.mode_conteneur_actif": "non"},
+                      'debug': False,
+                      'id': 3,
+                      'mode': 'normal',
+                      'namespace': 'creole',
+                      'session_id': session_id,
+                      'timestamp': values['timestamp'],
+                      'username': 'test'}
+
+
+@pytest.mark.asyncio
+async def test_server_filter_configure():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.server.start',
+                                    fake_context,
+                                    id=3)
+    session_id = session['session_id']
+    await dispatcher.call('v1',
+                          'session.server.configure',
+                          fake_context,
+                          session_id=session_id,
+                          action='modify',
+                          name='general.mode_conteneur_actif',
+                          value='oui')
+    list_result = await dispatcher.call('v1', 
+                                        'session.server.list',
+                                        fake_context)
+    values = await dispatcher.call('v1',
+                                   'session.server.get',
+                                   fake_context,
+                                   session_id=session_id,
+                                   name="general.mode_conteneur_actif")
+    assert values == {'content': {"general.mode_conteneur_actif": "oui"},
+                      'debug': False,
+                      'id': 3,
+                      'mode': 'normal',
+                      'namespace': 'creole',
+                      'session_id': session_id,
+                      'timestamp': values['timestamp'],
+                      'username': 'test'}
+
+
+@pytest.mark.asyncio
+async def test_server_filter_validate():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.server.start',
+                                    fake_context,
+                                    id=3)
+    session_id = session['session_id']
+    await dispatcher.call('v1',
+                          'session.server.validate',
+                          fake_context,
+                          session_id=session_id)
+
+
+@pytest.mark.asyncio
+async def test_server_stop():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.server:
+        await config_module.on_join(fake_context)
+    assert not await dispatcher.call('v1', 
+                                     'session.server.list',
+                                     fake_context)
+    start = await dispatcher.call('v1', 
+                                  'session.server.start',
+                                  fake_context,
+                                  id=3)
+    session_id = start['session_id']
+    assert await dispatcher.call('v1', 
+                                 'session.server.list',
+                                 fake_context)
+    await dispatcher.call('v1', 
+                          'session.server.stop',
+                          fake_context,
+                          session_id=session_id)
+    assert not await dispatcher.call('v1', 
+                                     'session.server.list',
+                                     fake_context)
+
+
+# servermodel
+@pytest.mark.asyncio
+async def test_servermodel_start():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    await dispatcher.call('v1', 
+                          'session.servermodel.start',
+                          fake_context,
+                          id=1)
+
+
+@pytest.mark.asyncio
+async def test_servermodel_list():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    assert not await dispatcher.call('v1', 
+                                     'session.servermodel.list',
+                                     fake_context)
+    await dispatcher.call('v1', 
+                          'session.servermodel.start',
+                          fake_context,
+                          id=1)
+    assert await dispatcher.call('v1', 
+                                 'session.servermodel.list',
+                                 fake_context)
+
+
+@pytest.mark.asyncio
+async def test_servermodel_filter_namespace():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.servermodel.start',
+                                    fake_context,
+                                    id=1)
+    session_id = session['session_id']
+    namespace = 'containers'
+    await dispatcher.call('v1',
+                          'session.servermodel.filter',
+                          fake_context,
+                          session_id=session_id,
+                          namespace=namespace)
+    list_result = await dispatcher.call('v1', 
+                                        'session.servermodel.list',
+                                        fake_context)
+    assert list_result[0]['namespace'] == namespace
+
+
+@pytest.mark.asyncio
+async def test_servermodel_filter_mode():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.servermodel.start',
+                                    fake_context,
+                                    id=1)
+    session_id = session['session_id']
+    assert session['mode'] == 'normal'
+    mode = 'expert'
+    await dispatcher.call('v1',
+                          'session.servermodel.filter',
+                          fake_context,
+                          session_id=session_id,
+                          mode=mode)
+    list_result = await dispatcher.call('v1', 
+                                        'session.servermodel.list',
+                                        fake_context)
+    assert list_result[0]['mode'] == mode
+
+
+@pytest.mark.asyncio
+async def test_servermodel_filter_debug():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.servermodel.start',
+                                    fake_context,
+                                    id=1)
+    session_id = session['session_id']
+    assert session['debug'] == False
+    debug = True
+    await dispatcher.call('v1',
+                          'session.servermodel.filter',
+                          fake_context,
+                          session_id=session_id,
+                          debug=debug)
+    list_result = await dispatcher.call('v1', 
+                                        'session.servermodel.list',
+                                        fake_context)
+    assert list_result[0]['debug'] == debug
+
+
+@pytest.mark.asyncio
+async def test_servermodel_filter_get():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.servermodel.start',
+                                    fake_context,
+                                    id=1)
+    session_id = session['session_id']
+    values = await dispatcher.call('v1',
+                                   'session.servermodel.get',
+                                   fake_context,
+                                   session_id=session_id)
+    assert values == {'content': {"general.mode_conteneur_actif": "non",
+                                  "general.master.master": [],
+                                  "general.master.slave1": [],
+                                  "general.master.slave2": []},
+                       'debug': False,
+                       'id': 1,
+                       'mode': 'normal',
+                       'namespace': 'creole',
+                       'session_id': session_id,
+                       'timestamp': values['timestamp'],
+                       'username': 'test'}
+
+
+@pytest.mark.asyncio
+async def test_servermodel_filter_get_one_value():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.servermodel.start',
+                                    fake_context,
+                                    id=1)
+    session_id = session['session_id']
+    values = await dispatcher.call('v1',
+                                   'session.servermodel.get',
+                                   fake_context,
+                                   session_id=session_id,
+                                   name="general.mode_conteneur_actif")
+    assert values == {'content': {"general.mode_conteneur_actif": "non"},
+                      'debug': False,
+                      'id': 1,
+                      'mode': 'normal',
+                      'namespace': 'creole',
+                      'session_id': session_id,
+                      'timestamp': values['timestamp'],
+                      'username': 'test'}
+
+
+@pytest.mark.asyncio
+async def test_servermodel_filter_configure():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.servermodel.start',
+                                    fake_context,
+                                    id=1)
+    session_id = session['session_id']
+    await dispatcher.call('v1',
+                          'session.servermodel.configure',
+                          fake_context,
+                          session_id=session_id,
+                          action='modify',
+                          name='general.mode_conteneur_actif',
+                          value='oui')
+    list_result = await dispatcher.call('v1', 
+                                        'session.servermodel.list',
+                                        fake_context)
+    values = await dispatcher.call('v1',
+                                   'session.servermodel.get',
+                                   fake_context,
+                                   session_id=session_id,
+                                   name="general.mode_conteneur_actif")
+    assert values == {'content': {"general.mode_conteneur_actif": "oui"},
+                      'debug': False,
+                      'id': 1,
+                      'mode': 'normal',
+                      'namespace': 'creole',
+                      'session_id': session_id,
+                      'timestamp': values['timestamp'],
+                      'username': 'test'}
+
+
+@pytest.mark.asyncio
+async def test_servermodel_filter_validate():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    session = await dispatcher.call('v1', 
+                                    'session.servermodel.start',
+                                    fake_context,
+                                    id=1)
+    session_id = session['session_id']
+    await dispatcher.call('v1',
+                          'session.servermodel.validate',
+                          fake_context,
+                          session_id=session_id)
+
+
+@pytest.mark.asyncio
+async def test_servermodel_stop():
+    fake_context = get_fake_context('session')
+    config_module = dispatcher.get_service('config')
+    if not config_module.servermodel:
+        await config_module.on_join(fake_context)
+    assert not await dispatcher.call('v1', 
+                                     'session.servermodel.list',
+                                     fake_context)
+    start = await dispatcher.call('v1', 
+                                  'session.servermodel.start',
+                                  fake_context,
+                                  id=1)
+    session_id = start['session_id']
+    assert await dispatcher.call('v1', 
+                                 'session.servermodel.list',
+                                 fake_context)
+    await dispatcher.call('v1', 
+                          'session.servermodel.stop',
+                          fake_context,
+                          session_id=session_id)
+    assert not await dispatcher.call('v1', 
+                                     'session.servermodel.list',
+                                     fake_context)