I'm getting lots of complaints from our users that the connectivity to our OWA is very slow. Everytime I check, it seems fine to me, but we have over 20 users in different offices / networks with the same complaint. We're running Exchange 2010 SP1 w/ Rollup 1 on a Windows 2008 R2 box. There's plenty of memory and cpu on this machine so thats definately not the cause. Our Exchange is sitting behind an MS TMG 2010 Server. I did notice in the event viewer on the Exchange server that we had several of these entries: EventID: 5139 Source: WAS "A listener channel for protocol 'http' in worker process '4388' serving application pool 'MSExchangeOWAAppPool' reported a listerner channel failure.
Could this be the cause? Whats the suggested solution? How do I troubleshoot this?