diff --git a/lemur/common/managers.py b/lemur/common/managers.py
index 9bcdf1c9..6205a019 100644
--- a/lemur/common/managers.py
+++ b/lemur/common/managers.py
@@ -8,6 +8,8 @@
 """
 from flask import current_app
 
+from lemur.exceptions import InvalidConfiguration
+
 
 # inspired by https://github.com/getsentry/sentry
 class InstanceManager(object):
@@ -58,8 +60,10 @@ class InstanceManager(object):
                     results.append(cls())
                 else:
                     results.append(cls)
+            except InvalidConfiguration as e:
+                current_app.logger.warning("Plugin '{0}' may not work correctly. {1}".format(class_name, e))
             except Exception as e:
-                current_app.logger.exception('Unable to import %s. Reason: %s', cls_path, e)
+                current_app.logger.exception("Unable to import {0}. Reason: {1}".format(cls_path, e))
                 continue
         self.cache = results
 
diff --git a/lemur/common/utils.py b/lemur/common/utils.py
index 921a5ee8..7cfca4f4 100644
--- a/lemur/common/utils.py
+++ b/lemur/common/utils.py
@@ -14,6 +14,8 @@ from cryptography.hazmat.backends import default_backend
 
 from flask_restful.reqparse import RequestParser
 
+from lemur.exceptions import InvalidConfiguration
+
 paginated_parser = RequestParser()
 
 paginated_parser.add_argument('count', type=int, default=10, location='args')
@@ -61,6 +63,4 @@ def validate_conf(app, required_vars):
     """
     for var in required_vars:
         if not app.config.get(var):
-            raise Exception("Required variable {var} is not set, ensure that it is set in Lemur's configuration file".format(
-                var=var
-            ))
+            raise InvalidConfiguration("Required variable '{var}' is not set in Lemur's conf.".format(var=var))
diff --git a/lemur/exceptions.py b/lemur/exceptions.py
index ca807db9..cb089764 100644
--- a/lemur/exceptions.py
+++ b/lemur/exceptions.py
@@ -7,8 +7,8 @@ from flask import current_app
 
 
 class LemurException(Exception):
-    def __init__(self):
-        current_app.logger.error(self)
+    def __init__(self, *args, **kwargs):
+        current_app.logger.exception(self)
 
 
 class DuplicateError(LemurException):
@@ -19,41 +19,11 @@ class DuplicateError(LemurException):
         return repr("Duplicate found! Could not create: {0}".format(self.key))
 
 
-class AuthenticationFailedException(LemurException):
-    def __init__(self, remote_ip, user_agent):
-        self.remote_ip = remote_ip
-        self.user_agent = user_agent
-
-    def __str__(self):
-        return repr("Failed login from: {} {}".format(self.remote_ip, self.user_agent))
-
-
-class IntegrityError(LemurException):
-    def __init__(self, message):
-        self.message = message
-
-    def __str__(self):
-        return repr(self.message)
-
-
-class AssociatedObjectNotFound(LemurException):
-    def __init__(self, message):
-        self.message = message
-
-    def __str__(self):
-        return repr(self.message)
-
-
 class InvalidListener(LemurException):
     def __str__(self):
         return repr("Invalid listener, ensure you select a certificate if you are using a secure protocol")
 
 
-class CertificateUnavailable(LemurException):
-    def __str__(self):
-        return repr("The certificate requested is not available")
-
-
 class AttrNotFound(LemurException):
     def __init__(self, field):
         self.field = field
@@ -62,16 +32,5 @@ class AttrNotFound(LemurException):
         return repr("The field '{0}' is not sortable".format(self.field))
 
 
-class NoPersistanceFound(Exception):
-    def __str__(self):
-        return repr("No peristence method found, Lemur cannot persist sensitive information")
-
-
-class NoEncryptionKeyFound(Exception):
-    def __str__(self):
-        return repr("Aborting... Lemur cannot locate db encryption key, is ENCRYPTION_KEY set?")
-
-
-class InvalidToken(Exception):
-    def __str__(self):
-        return repr("Invalid token")
+class InvalidConfiguration(Exception):
+    pass
diff --git a/setup.py b/setup.py
index c5a000e6..881913bc 100644
--- a/setup.py
+++ b/setup.py
@@ -187,6 +187,7 @@ setup(
             'cryptography_issuer = lemur.plugins.lemur_cryptography.plugin:CryptographyIssuerPlugin',
             'cfssl_issuer = lemur.plugins.lemur_cfssl.plugin:CfsslIssuerPlugin',
             'digicert_issuer = lemur.plugins.lemur_digicert.plugin:DigiCertIssuerPlugin',
+            'digicert_cis_issuer = lemur.plugins.lemur_digicert.plugin:DigiCertCISIssuerPlugin',
         ],
     },
     classifiers=[