Outlook 2007 prompts for password

Posted on 2010-01-06
Last Modified: 2012-05-08
I have a network running SBS 2008. All of a sudden all user with Outlook 2007 get prompted for their password. The password is never accepted. After cancelling a few times, they get into Outlook. This happens only in Outlook 2007, not 2003. I have gone into Exchange Proxy Settings and turned that off completely but that did not help.

One user with a MAC can no longer use his email. I suspect that issue is related.

Since this is happening on all workstations running Outlook 2007, I've got to assume it is server related.
Question by:ajdratch
    LVL 74

    Accepted Solution

    First thing to do is make sure you have at least Rollup 9 installed for Exchange 2007

    Then the following 2 websites provide solutions to the above.
    I have had mixed comments some say the first work and some say the second work but the second one seems to be winning at the moment:

    See the section about enabling Kernel Authentication:
    LVL 6

    Expert Comment

    Try this to fix the problem.  It has worked on my machines in the past.

    Author Closing Comment

    Your link with the information below solved the problem:

    I opened IIS on the

    Exchange server and checked the following directories under the

    default website (the root site(default web site), oab, autodiscover).

    Under the directory security tab, click Edit in the Secure

    Communications section. I had the require SSL checked and the 128bit

    encryption, but under Client Certificates, it was set to ignore. Once

    I changed that to Accept for each of the folders, stopped and started

    IIS, I stopped being prompted all the time for credentials. Hopefully


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