Exchange 2013 Enterprise SP1 / Windows Server 2008 R2 SP1
I have configured site resilience setup with the following at two sites:
- two CAS servers
- six MB servers
Traffic to the CAS servers pass through HLB.
I just discovered that the "01" CAS server at each site is not accepting Exchange traffic.
If I telnet to one of the Exchange ports, it looks like there is a connection, however the moment any character is entered, the connection dies.
For example
- telnet Site01CAS01 25
- ( screen goes blank and DOES NOT display the expected "220 servername Microsoft ESMTP ...." message )
- when I attempt to enter "ehlo" the moment I enter "e" the session is disconnected.
I can successfully perform a telnet connection to the CAS02 server and run through the complete send a test message through telnet process. The session disconnect occurs on the CAS01 server at each site for ANY port controlled by Exchange: 25, 143, 587, 717, 993
I can successfully telnet to ports NOT controlled by Exchange: 80, 81, 8080, 443
There appears to be nothing essentially wrong with IIS
The firewall is DISABLED.
I discovered this issue yesterday.
I upgraded to Excahgne 2013 SP1 10 days ago.
I cannot say for sure if this condition existed before the SP! upgrade. I upgraded from CU1 to SP1
Any thoughts?
Thanks! Tom