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After a recent outage, all of our Outlook 2007 clients in cached exchange mode are getting prompted for a network password. How do I figure out why this is happening?

If I go into the client and change the security from the default of Negotiate Authentication to NTLM it stops prompting for a password.  However I need to figure out why this is happening so I dont have to do it this way as we are getting ready for a large Outlook rollout.  I read Outlook 2k7 uses NTLM by default so why would a network outage change this?
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AIT
Asked:
AIT
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1 Solution
 
Exchange_GeekCommented:
On the Exchange Server which authentication do you have for /Autodiscover ?
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AITAuthor Commented:
Integrated windows and basic
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Exchange_GeekCommented:
Please remove Basic Authentication, let your users be authenticated once they logon to their windows server.

Post unchecking the check box, please run iisrest and test once more
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AITAuthor Commented:
We found that someone had put a dns zone in that was screwing stuff up.  After this was deleted, the login prompts went away.  I am intrigued by your recent suggestion.  Out of the box it has these checked.  Were you suggeting this as a way to fix the problem or as a best practice?  Let me know
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Exchange_GeekCommented:
Well its always a best practice to have WIA checked - unless you have people from outside ur network logging in.

Wow, that was a pretty innovative solution for such an issue.
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AITAuthor Commented:
I think there was more to this, and yes I agree, it is a little quirky.  Thanks for your input
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Exchange_GeekCommented:
Just trying my best to help you with my bit of exp, however thanks for providing the solution hinting to DNS - I wouldn't actually look at that since I wouldn't have any one touch my DNS servers without knowing what they are doing.

But hey it is a different sort of solution :)

Take Care

God Bless.
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AITAuthor Commented:
I totally agree with you, and it is a point of contention.  And, yes, I am chuckling a little
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