Users are Prompted for UserName & Password After Exchange 2010 Cross Site Database Switchover

I've deployed Exchange 2010 across 2 sites and I'm currently piloting with other members of the technology team.  I've had a number of issues where users are prompted for their credencials after a failover.  I was able to resolve most of these by depoying the GPO templates to disable the RPC/HTTP stuff on the internal Outlook clients.  This seems to have completely fixed the problem for in-site switchovers, but we still get some of these problems after a cross-site switchovers.  It's not exactly consistent, sometimes it does sometimes it doesn't.

We only have hardware load balancers in each location no geo-LB's.  I'm thinking that might be part of the problem when the original CAS Array issues the wrong server response it's technically a new connection coming into the CAS Array in the site I just switched the DB into.

The DAG settings do not allow cross site RPCClientAccess, and since I'm using SP2 RU4 I think the expected default behavior should be the Outlook profile reconfigures based on the wrong server response and subsequent discovery attemp.  What I'm wondering is if the prompts are expected behavior given our isolated (non-geo) load balancers?

This is obviously a complicated topic and the parameters have changed as 2010 has been updated, but if any one can shed some light on this or perhaps point me to other resources MS or not I that would be great.

Thanks.
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nashiookaAsked:
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nashiookaConnect With a Mentor Author Commented:
I can not say for certain the registry had any affect.  What I did discover was that group policies that were used to disable the RPC/HTTP stuff on the internal Outlook clients were not being applied to some workstations. After correcting that the behavior looked to be as expected.  Cross-site DB*overs asked the user to restart Outlook, while in-site DB*overs only caused a momentary disconnect.
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MegaNuk3Commented:
Try useWindowsUserCredentials=1 reg key on a couple outlook 2007/2010 clients and then do the cross site failover and see if the prompts are gone.

http://support.microsoft.com/kb/956531
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nashiookaAuthor Commented:
Thanks for your reply.  I'm going to test in the morning, and will let you know if it works.
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MegaNuk3Commented:
OK
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nashiookaAuthor Commented:
It's not completely clear the other suggested solutions did anything at all.  Looks like this one was figured out before it was asked and there were extenuating circumstances, having less to do with Exchange and more to do with AD.
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