Please Correct Your Exchange Server Credentials Every Few Hours

We're running Exchange Server 2003 SP2 and publishing OWA and Exchange ActiveSync through ISA.  I just upgraded from ISA 2004 to ISA 2006 yesterday and since the upgrade, on my Windows Mobile device, every few hours I'm prompted to re-enter my credentials with "Please Correct Your Exchange Server Credentials".  I can successfully enter my credentials when prompted and my device the successfully syncs for a few hours after which I'm prompted again.  This didn't happen under ISA 2004; it just started happening yesterday under ISA 2006.  How do I correct this?
karinerivetAsked:
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MrLonandBCommented:
You probably have, but just checking: Have you reset the mobile device...re-entering your credentials in the setup?
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karinerivetAuthor Commented:
If you're asking if I wiped my device and set it up again the answer is no because everything was working fine under ISA 2004.  I haven't changed anything on my device; I just upgraded the ISA server from 2004 to 2006.
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karinerivetAuthor Commented:
I just completed a wipe and reload of my device and the same problem persists.  Additionally, it appears that the prompt doesn't come up every few hours, but rather after any time that the data connection to Exchange ActiveSync is ended, i.e. if I use Internet Explorer, if I use Live Search, etc.  Once the data connection to Exchange ActiveSync is ended, the next time that my device attempts to sync email, etc. it prompts me to enter my password.  Again this problem only started happening yesterday after I upgraded ISA from 2004 to 2006.  How do I fix this?
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MrLonandBCommented:
If you look at the Event Viewer on both the Exchange and ISA Server...do you see any authentication errors or sync errors at the time when you are loosing your connection?
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karinerivetAuthor Commented:
I checked both the event log and the application log on both the ISA and the Exchange servers and there are no errors.
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karinerivetAuthor Commented:
I may have resolved the issue by setting Authentication Delegation from Basic to No Delegation, But Client May Authenticate Directly.  I'll report back when I know for certain.
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karinerivetAuthor Commented:
That didn't work either so I reverted it back, but I just found another setting that may work...  I disabled "Apply session timeout to non-browser clients".  I'll report back again when I know for certain.
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karinerivetAuthor Commented:
Disabling "Apply session timeout to non-browser clients" did fix the problem.
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