I have done some internet searching but seems I can not get something concrete. I have 3 CAS servers, only on one of them I keep on getting error message. I have tried the script on the servers, only one of them I get the error message. If I ran the script"Test-OutlookConnectivity -Protocol:Tcp" I get an error message, but if I ran the script "Test-OutlookConnectivity -Protocol:Http" it passes the test. I have restarted all the services, restarted IIS but still I cannot get the issue solved. We also have HLB. So where I can I figure out where I can solve this issue. Exchange 2010 SP2 RU4v2.
I have seen this links as well, but does not help