diff --git a/RO-SDN-arista_cloudvision/osm_rosdn_arista_cloudvision/wimconn_arista.py b/RO-SDN-arista_cloudvision/osm_rosdn_arista_cloudvision/wimconn_arista.py
index 4708a7c..01c8682 100644
--- a/RO-SDN-arista_cloudvision/osm_rosdn_arista_cloudvision/wimconn_arista.py
+++ b/RO-SDN-arista_cloudvision/osm_rosdn_arista_cloudvision/wimconn_arista.py
@@ -38,8 +38,7 @@
 import logging
 import uuid
 from enum import Enum
-from requests import RequestException
-
+from requests import RequestException, ConnectionError, ConnectTimeout, Timeout
 from cvprac.cvp_client import CvpClient
 from cvprac.cvp_api import CvpApi
 from cvprac.cvp_client_errors import CvpLoginError, CvpSessionLogOutError, CvpApiError
@@ -50,15 +49,16 @@
 
 
 class SdnError(Enum):
-    UNREACHABLE = 'Unable to reach the WIM.',
+    UNREACHABLE = 'Unable to reach the WIM url, connect error.',
+    TIMEOUT = 'Unable to reach the WIM url, timeout.',
     VLAN_INCONSISTENT = \
         'VLAN value inconsistent between the connection points',
     VLAN_NOT_PROVIDED = 'VLAN value not provided',
     CONNECTION_POINTS_SIZE = \
         'Unexpected number of connection points: 2 expected.',
     ENCAPSULATION_TYPE = \
-        'Unexpected service_endpoint_encapsulation_type. \
-         Only "dotq1" is accepted.',
+        'Unexpected service_endpoint_encapsulation_type. ' \
+        'Only "dotq1" is accepted.',
     BANDWIDTH = 'Unable to get the bandwidth.',
     STATUS = 'Unable to get the status for the service.',
     DELETE = 'Unable to delete service.',
@@ -188,10 +188,16 @@
         try:
             self.__load_topology()
             self.__load_switches()
+        except (ConnectTimeout, Timeout) as ct:
+            raise SdnConnectorError(message=SdnError.TIMEOUT + " " + str(ct), http_code=408)
+        except ConnectionError as ce:
+            raise SdnConnectorError(message=SdnError.UNREACHABLE + " " + str(ce), http_code=404)
         except SdnConnectorError as sc:
             raise sc
+        except CvpLoginError as le:
+            raise SdnConnectorError(message=le.msg, http_code=500) from le
         except Exception as e:
-            raise SdnConnectorError(message="Unable to load switches from CVP",
+            raise SdnConnectorError(message="Unable to load switches from CVP" + " " + str(e),
                                     http_code=500) from e
         self.logger.debug("Using topology {} in Arista Leaf switches: {}".format(
             self.topology,
@@ -354,12 +360,12 @@
         except CvpLoginError as e:
             self.logger.info(str(e))
             self.client = None
-            raise SdnConnectorError(message=SdnError.UNAUTHORIZED,
+            raise SdnConnectorError(message=SdnError.UNAUTHORIZED + " " + str(e),
                                     http_code=401) from e
         except Exception as ex:
             self.client = None
             self.logger.error(str(ex))
-            raise SdnConnectorError(message=SdnError.INTERNAL_ERROR,
+            raise SdnConnectorError(message=SdnError.INTERNAL_ERROR + " " + str(ex),
                                     http_code=500) from ex
 
     def get_connectivity_service_status(self, service_uuid, conn_info=None):
@@ -463,12 +469,12 @@
         except CvpLoginError as e:
             self.logger.info(str(e))
             self.client = None
-            raise SdnConnectorError(message=SdnError.UNAUTHORIZED,
+            raise SdnConnectorError(message=SdnError.UNAUTHORIZED + " " + str(e),
                                     http_code=401) from e
         except Exception as ex:
             self.client = None
             self.logger.error(str(ex), exc_info=True)
-            raise SdnConnectorError(message=str(ex),
+            raise SdnConnectorError(message=str(ex) + " " + str(ex),
                                     http_code=500) from ex
 
     def create_connectivity_service(self, service_type, connection_points,
@@ -547,7 +553,7 @@
         except CvpLoginError as e:
             self.logger.info(str(e))
             self.client = None
-            raise SdnConnectorError(message=SdnError.UNAUTHORIZED,
+            raise SdnConnectorError(message=SdnError.UNAUTHORIZED + " " + str(e),
                                     http_code=401) from e
         except SdnConnectorError as sde:
             raise sde
@@ -737,7 +743,7 @@
                 if not (cls_perSw.get(s) and cls_perSw[s][0].get('config')):
                     # when there is no configuration, means that there is no interface
                     # in the switch to be connected, so the configLet has to be removed from CloudVision
-                    # after removing the ConfigLet fron the switch if it was already there
+                    # after removing the ConfigLet from the switch if it was already there
 
                     # get config let name and key
                     cl = cls_perSw[s]
@@ -1141,7 +1147,7 @@
         except CvpLoginError as e:
             self.logger.info(str(e))
             self.client = None
-            raise SdnConnectorError(message=SdnError.UNAUTHORIZED,
+            raise SdnConnectorError(message=SdnError.UNAUTHORIZED + " " + str(e),
                                     http_code=401) from e
         except SdnConnectorError as sde:
             raise sde
@@ -1150,7 +1156,7 @@
             self.logger.error(ex)
             if self.raiseException:
                 raise ex
-            raise SdnConnectorError(message=SdnError.INTERNAL_ERROR,
+            raise SdnConnectorError(message=SdnError.INTERNAL_ERROR + " " + str(ex),
                                     http_code=500) from ex
 
     def __addMetadata(self, service_uuid, service_type, vlan_id):
@@ -1269,7 +1275,7 @@
         except CvpLoginError as e:
             self.logger.info(str(e))
             self.client = None
-            raise SdnConnectorError(message=SdnError.UNAUTHORIZED,
+            raise SdnConnectorError(message=SdnError.UNAUTHORIZED + " " + str(e),
                                     http_code=401) from e
         except SdnConnectorError as sde:
             raise sde
@@ -1305,7 +1311,7 @@
         except CvpLoginError as e:
             self.logger.info(str(e))
             self.client = None
-            raise SdnConnectorError(message=SdnError.UNAUTHORIZED,
+            raise SdnConnectorError(message=SdnError.UNAUTHORIZED + " " + str(e),
                                     http_code=401) from e
         except SdnConnectorError as sde:
             raise sde
@@ -1314,7 +1320,7 @@
             self.logger.error(ex)
             if self.raiseException:
                 raise ex
-            raise SdnConnectorError(message=SdnError.INTERNAL_ERROR,
+            raise SdnConnectorError(message=SdnError.INTERNAL_ERROR + " " + str(ex),
                                     http_code=500) from ex
 
     def get_all_active_connectivity_services(self):
@@ -1340,7 +1346,7 @@
         except CvpLoginError as e:
             self.logger.info(str(e))
             self.client = None
-            raise SdnConnectorError(message=SdnError.UNAUTHORIZED,
+            raise SdnConnectorError(message=SdnError.UNAUTHORIZED + " " + str(e),
                                     http_code=401) from e
         except SdnConnectorError as sde:
             raise sde