diff --git a/redfish/exception.py b/redfish/exception.py
index 5152f80..d54feff 100644
--- a/redfish/exception.py
+++ b/redfish/exception.py
@@ -15,8 +15,13 @@ class RedfishException(Exception):
 class ConnectionFailureException(RedfishException):
     def __init__(self, message, **kwargs):
         super(ConnectionFailureException, self).__init__(message, **kwargs)
-        self.advices = '1- Check if the url is the correct one\n' + \
-                       '2- Check if your device is answering on the network\n'
+        self.advices = \
+            '1- Check if the url is the correct one\n' + \
+            '2- Check if your device is answering on the network\n' + \
+            '3- Check if your device has a valid trusted certificat\n' + \
+            '   You can use openssl to validate it using the command :\n' + \
+            '   openssl s_client -showcerts -connect <server>:443\n' + \
+            '4- Use option "--insecure" to connect without checking certificate\n'
 
 
 class InvalidRedfishContentException(RedfishException):