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    <p>Keith,</p> <p>Being that it appears to happen most after the user has been idle, I'm leaning towards some kind event (i.e. a session timeout) that might invalidate the credentials for your server. I'm assuming one server since you didn't mention any web farm.</p> <p>A part of me thinks you've likely hammered the session timeout angle. Unless you felt safe trusting that the users would 'auto authenticate' and timing out mid operation wouldn't cause it to fail. That said, I'm not sure I'd completely trust that is the case. To at least eliminate this possibility I would add a routine that logs information about the current session/credentials before that operation is started. Even though the user is "always logged in" assuming they are on their computer I've seen weird issues with VPNs, proxy servers, server double hops, IE configurations for 'trusted zones' and 'intranet' settings. Even a computer suddenly having its route to the server changed could cause issues. I'm not sure the network emulation on a VM would play a part, but who knows.</p> <p>Here is a 'starter' article regarding IE and it's complex approach to authentication and the role it plays as the client application accessing your Intranet MVC app. (It pays to dig deep on how IE auto-magically authenticates in a Windows AD environment.)</p> <p><a href="http://support.microsoft.com/kb/258063/en-us" rel="nofollow">http://support.microsoft.com/kb/258063/en-us</a></p> <p>Here is a related problem someone had due to a double-hop causing 401s. I've also included a link to another good 'starter page' on investigating these types of issues.</p> <p><a href="http://social.msdn.microsoft.com/Forums/en/sqlreportingservices/thread/6d1604e5-e739-41e4-89a5-c6681bff2e61" rel="nofollow">http://social.msdn.microsoft.com/Forums/en/sqlreportingservices/thread/6d1604e5-e739-41e4-89a5-c6681bff2e61</a></p> <p><a href="http://blogs.technet.com/b/askds/archive/2008/06/13/understanding-kerberos-double-hop.aspx" rel="nofollow">http://blogs.technet.com/b/askds/archive/2008/06/13/understanding-kerberos-double-hop.aspx</a></p> <p>Sorry if anything above you already knew or for the general nature of my response. It's tough without actually having network access or being able to add logging to your code. I hope I've pointed you in the right direction.</p>
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    1. COThis is good info. Thanks for all the pointers!
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      1. USKeith Hill
    2. COYou're welcome, should you get more information based no some of those tests I'd be curious to hear more to dial in the troubleshooting direction.
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