We are seeing an issue, where Outlook clients are getting disconnecting from Exchange for 15-60 minutes randomly. We are using the Barracuda WAF to "load balance" the connections to the 2 backend Exchange servers. The 2 Exchange servers are set up as a primary and failover, so unless there are issues, all traffic goes to the primary. If we use a hosts file to bypass the Barracuda, and go directly to the primary Exchange server, the issue seems to disappear, which would indicate something with the Barracuda WAF is causing issues.
I have been unable to find a best practices doc from Barracuda for this scenario (only one for their actual load balancer which has different settings). Has anyone seen this, or have an idea what could be tweaked on the Barracuda to resolve?