SBS2008 Domain Users Suddenly Receiving Authentication Prompt when accessing OL2007 via Exchange

Suddenly I have end-users within a domain environment being continuously prompted to type in their UserID/Password when accessing Outlook 2007.

Using SBS 2008, Exchange 2007 SP1, Outlook Anywhere.  Majority are OL2007, 1x is OL2010, 1x 2003.

It's been working fine and with NO issue until today.  I've tried/checked the following:

1.  EWS directory in IIS to ensure Windows Authentication was enabled.
2.  Under IIS directory; ensuring that the certificate was Accepted versus Ignored.
3.  Switching from Basic to NTLM Authentication on Server and Client Machine.
4.  Removing the need to access via Exchange HTTP Proxy altogether.
5.  Renamed the folder under %userprofile%\appdata\roaming\microsoft\protect.

I did notice that the PC's with Windows 7 updated to SP1 but we've got some XPSP3 machines so that isn't the issue.

No joy either way.  Any suggestions?

LVL 4
BGTSLLCAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Felix LevenSenior System and DatabaseadministratorCommented:
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
BGTSLLCAuthor Commented:
This led me in the right direction.  The initial rollup 9 didn't work but applying rollup 5 and/or 10 resolved the issue.

Thanks again!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.