I just worked with Microsoft on an Exchange SP4 issue.
What I have: Two Exchange 5.5 SP4 Servers connecting over a Site Connector. Both have two NICs - one internal, one external.
After applying SP4, my Site Connector and Trust went down. Apparently there is an issue with SP4 that requires you to bind the internal IP address first, then the external IP address under the Network Properties.
After changing the binding order, everything came back up fine.
It took me 20 hours of troubleshooting, and 7 hours on the phone with Microsoft before I found someone that figured this out!
What I have: Two Exchange 5.5 SP4 Servers connecting over a Site Connector. Both have two NICs - one internal, one external.
After applying SP4, my Site Connector and Trust went down. Apparently there is an issue with SP4 that requires you to bind the internal IP address first, then the external IP address under the Network Properties.
After changing the binding order, everything came back up fine.
It took me 20 hours of troubleshooting, and 7 hours on the phone with Microsoft before I found someone that figured this out!