Hi,
We have a two-member Exchange 2010 CAS Array behind a LoadMaster (6.0-28a). We've been struggling with Outlook users constantly being prompted for credentials for some time. Other than that, everything works fine.
I put a sniffer on a client and I can see that without fail, the client sends about 5 RSTs in a row to the IP of the Virtual Server, which causes Outlook to fail back to the configured address of the public CAS server, which triggers the authentication prompt.
If I change the host file to send the client directly to each CAS member's IP address (bypassing the LM), this does not happen. In addition, disabling one real server at a time produces the logon prompt when each server operates alone.
So, it would seem that the LoadMaster is causing this RST. Any idea what I can check for?
Thanks,
-Thomas