diff --git a/source/collector.py b/source/collector.py
index b36dd4d..58119da 100644
--- a/source/collector.py
+++ b/source/collector.py
@@ -24,7 +24,7 @@
 import copy
 import analytics
 from queryHandler.Query import Query
-from messages import MSG
+from messages import MSG, ERR
 from collections import defaultdict
 from typing import Optional, Any, List
 from threading import Thread
@@ -216,7 +216,7 @@ def get_zimon_query(self):
         if not self.metricsaggr and not self.sensor:
             self.logger.error(MSG['QueryError'].
                               format('Missing metric or sensor name'))
-            raise cherrypy.HTTPError(400, MSG[400])
+            raise cherrypy.HTTPError(400, ERR[400])
 
         if self.metricsaggr:
             for key, value in self.metricsaggr.items():
diff --git a/source/confgenerator.py b/source/confgenerator.py
index a878eb3..be7bddd 100644
--- a/source/confgenerator.py
+++ b/source/confgenerator.py
@@ -111,6 +111,8 @@ def GET(self, **params):
 
         conn = cherrypy.request.headers.get('Host').split(':')
         if int(conn[1]) != int(self.attr.get('prometheus')):
+            self.logger.error(MSG['EndpointNotSupportedForPort'].
+                              format(cherrypy.request.script_name, str(conn[1])))
             raise cherrypy.HTTPError(400, ERR[400])
 
         # generate prometheus.yml
@@ -122,9 +124,7 @@ def GET(self, **params):
 
         else:
             self.logger.error(MSG['EndpointNotSupported'].format(cherrypy.request.script_name))
-            raise cherrypy.HTTPError(400,
-                                     MSG['EndpointNotSupported'].format(
-                                         cherrypy.request.script_name))
+            raise cherrypy.HTTPError(400, ERR[400])
 
         del cherrypy.response.headers['Allow']
         cherrypy.response.headers['Access-Control-Allow-Origin'] = '*'
diff --git a/source/messages.py b/source/messages.py
index 94550eb..e74c9c0 100644
--- a/source/messages.py
+++ b/source/messages.py
@@ -44,6 +44,7 @@
        'InconsistentParams': 'Received parameters {} inconsistent with request parameters {}',
        'SensorDisabled': 'Sensor for metric {} is disabled',
        'EndpointNotSupported': 'Endpoint {} you try to access is not supported',
+       'EndpointNotSupportedForPort': 'Endpoint {} is not supported for port {}',
        'NoData': 'Empty results received',  # Please check the pmcollector is properly configured and running.
        'NoSensorConfigData': 'No sensor configuration data parsed',
        'NoDataStartNextAttempt': 'No Metadata results received from the pmcollector. Start retry attempt {} in 60s (MAX_ATTEMPTS_COUNT:{})',
diff --git a/source/metadata.py b/source/metadata.py
index f76832a..32a2b05 100644
--- a/source/metadata.py
+++ b/source/metadata.py
@@ -26,7 +26,7 @@
 from queryHandler.Topo import Topo
 from queryHandler import SensorConfig
 from utils import execution_time
-from messages import MSG
+from messages import ERR, MSG
 from metaclasses import Singleton
 from time import sleep
 
@@ -186,7 +186,7 @@ def update(self, refresh_all=False):
         self.__metaData = Topo(self.qh.getTopology())
         if not (self.metaData and self.metaData.topo):
             self.logger.error(MSG['NoData'])  # Please check the pmcollector is properly configured and running.
-            raise cherrypy.HTTPError(404, MSG[404])
+            raise cherrypy.HTTPError(404, ERR[404])
         self.logger.details(MSG['MetaSuccess'])
         self.logger.debug(MSG['ReceivAttrValues'].format('parents', ", ".join(self.metaData.allParents)))
         return ({'msg': MSG['MetaSuccess']})
diff --git a/source/opentsdb.py b/source/opentsdb.py
index 0a113e4..127f571 100644
--- a/source/opentsdb.py
+++ b/source/opentsdb.py
@@ -283,7 +283,9 @@ def GET(self, **params):
 
         conn = cherrypy.request.headers.get('Host').split(':')
         if int(conn[1]) != int(self.port):
-            raise cherrypy.HTTPError(400, MSG[400])
+            self.logger.error(MSG['EndpointNotSupportedForPort'].
+                              format(cherrypy.request.script_name, str(conn[1])))
+            raise cherrypy.HTTPError(400, ERR[400])
 
         # /api/suggest
         if 'suggest' in cherrypy.request.script_name:
@@ -307,6 +309,11 @@ def GET(self, **params):
             supportedFilters['pm_filter'] = filterDesc
             resp = supportedFilters
 
+        else:
+            self.logger.error(MSG['EndpointNotSupported'].
+                              format(cherrypy.request.script_name))
+            raise cherrypy.HTTPError(400, ERR[400])
+
         del cherrypy.response.headers['Allow']
         cherrypy.response.headers['Access-Control-Allow-Origin'] = '*'
         # cherrypy.response.headers['Content-Type'] = 'application/json'
@@ -327,7 +334,7 @@ def POST(self):
             jreq = cherrypy.request.json
             if jreq.get('queries') is None:
                 self.logger.error(MSG['QueryError'].format('empty'))
-                raise cherrypy.HTTPError(400, MSG[400])
+                raise cherrypy.HTTPError(400, ERR[400])
 
             return self.query(jreq)
 
diff --git a/source/prometheus.py b/source/prometheus.py
index d5885e8..750a2f1 100644
--- a/source/prometheus.py
+++ b/source/prometheus.py
@@ -23,7 +23,7 @@
 import cherrypy
 import json
 import analytics
-from messages import MSG
+from messages import ERR, MSG
 from typing import Optional
 from cherrypy.process.plugins import Monitor
 from collector import SensorCollector, QueryPolicy
@@ -151,7 +151,9 @@ def GET(self, **params):
 
         conn = cherrypy.request.headers.get('Host').split(':')
         if int(conn[1]) != int(self.port):
-            raise cherrypy.HTTPError(400, MSG[400])
+            self.logger.error(MSG['EndpointNotSupportedForPort'].
+                              format(cherrypy.request.script_name, str(conn[1])))
+            raise cherrypy.HTTPError(400, ERR[400])
 
         if self.endpoints and self.endpoints.get(cherrypy.request.script_name,
                                                  None):
@@ -169,10 +171,9 @@ def GET(self, **params):
             return resString
 
         else:
-            self.logger.error(MSG['EndpointNotSupported'].format(sensor))
-            raise cherrypy.HTTPError(400,
-                                     MSG['EndpointNotSupported'].format(
-                                         cherrypy.request.script_name))
+            self.logger.error(MSG['EndpointNotSupported'].
+                              format(cherrypy.request.script_name))
+            raise cherrypy.HTTPError(400, ERR[400])
 
         del cherrypy.response.headers['Allow']
         cherrypy.response.headers['Access-Control-Allow-Origin'] = '*'