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Exchange 2010 MOWA SSO Issues

Submitted by tprindle1 on Thu, 10/09/2014 - 09:40

We are running Exchange 2010 with 2 DB servers and 2 Client Access servers(CAS). We are using the Microsoft software NLB (network load balancer) in front of the Exchange CAS servers.
We have Luminis 5 and are using the pickup.html method.

The issue we are seeing is that SSO only seems to work on one of the OWA servers at a time. If you happen to be directed to the non working OWA server you are presented with the logon prompt for OWA.

At first I thought it might be a Exchange CAS issue, but the server that works varies. One day CAS Server 1 will work, and then the next day CAS server 2 will work.

Any ideas?

Luminis Version: