Outlook 2007 prompting users to log in

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I have an issue when randomly Outlook 2007 SP2 clients get prompted to authenticate after being logged in for a certain (completely random) amount of time. Exchange and Outlook have been up and running for over 2 years without issue, this issue just sort of cropped up recently so I thought it may be related to a WIndows Update. I have over 5000 clients, and a very few are reporting the issue, but I want to get to the bottom of it. When you check "connection status" sometimes it shows "directory services" as disconnected, sometimes not. We have multiple DC's in each AD site, no AD issues, no DNS issues. It's not an autodiscover issue. YOu can run the "test email autoconfiguration" and it passes just fine. Restarting Outlook also fixes the issue 100% of the time, only for it to re-appear maybe an hour later, maybe 3 hours later, maybe 3 days later.

Backend is Exchange 2007 Enterprise SP1 UR9 running on Windows 2003 R2 SP2 x64 Enterprise. Have separate CAS+HT servers (2 in an NLB) and Mailbox Servers (4 servers in an SCC config 3 active 1 passive).

Clients are all XP SP2, Outlook 2007 SP2, all running in cached mode.

Gen Lin


Try to remove the windows cached credential and see if the issue persists:

1. On the user's PC, open Run, type:

control userpasswords2

2. Click Advanced tab, click Managed Passwords

3. Please remove the cached credential of your domain.

4. Log off then log in.



I already tried that as a troubleshooting step. Some of the users did not have a cached credential. The ones which did, I removed the cached credential and the issue re-appeared. I should have mentioned that in my earlier post.
I am at a loss on how to troubleshoot this, I have enabled the following loglevels to expert and that tells me nothing insightful

CAS2\MSExchange Autodiscover\Core
CAS2\MSExchange Autodiscover\Web
CAS2\MSExchange Autodiscover\Provider
CAS2\MSExchange Availability\Availability Service
CAS2\MSExchange Availability\Availability Service General
CAS2\MSExchange Availability\Availability Service Authentication
CAS2\MSExchange Availability\Availability Service Authorization

(am I logging the right stuff?)

I enabled tracelogging in the Outlook client on a few problematic people's pc's but the logfiles appear to be unreadable, they are .etl files which are somehow coded and I dont know how to decipher.

Any other help would be useful. At least 1 user I can attribute this to an account lockout issue coming from somewhere.
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