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Outlook 2007 prompts you repeatedly for a password under certain network conditions
Article ID: 956531 - View products that this article applies to.
Under certain network conditions, Microsoft Office Outlook 2007 prompts you repeatedly for a password. If you do not enter a password or if you enter an incorrect password, Outlook 2007 may silently enter Offline mode. In this case, you do not receive an error message or a notification, and you will not be connected to the mailbox.
Important Do not apply this hotfix if an account lockout policy has been applied.
For an overview of the account lockout policy, visit the following Microsoft TechNet Web site:
How to obtain the hotfixThis issue is fixed in the Outlook 2007 hotfix package 957909. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/957909/ )Description of the Outlook 2007 post-Service Pack 1 hotfix package: September 24, 2008
How to enable the hotfixImportant This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756To have us enable the hotfix for you, go to the "Fix it for me" section. If you prefer to fix this problem yourself, go to the "Let me fix it myself" section.
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Fix it for me
To fix this problem automatically, click the Fix it button or link. In the File Download dialog box, click Run and then follow the steps in the Fix it Wizard.
Fix this problem
Microsoft Fix it 50636
Then, go to the "Did this fix the problem?" section.
Let me fix it myselfTo enable the hotfix, follow these steps:
(default to FALSE, 1 is TRUE, and 0 is FALSE)
You can use the following registry entry to set a timeout period. If we do receive an authentication error, attempts to acquire another set of credentials will fail for a timeout period set in this registry entry.
[defaults to 10000 msec (0x2710), maximum value is 2147483648 (0x8000000)]
Did this fix the problem?
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This hotfix will not resolve this problem if the following conditions are true:
In this scenario, Outlook connects to Active Directory by first doing a referral remote procedure call (RPC) against the Exchange Server. This is followed by a second RPC to Active Directory that the referral provides. Neither of these RPCs requires any information about the mailbox account. In this case, the mailbox account is Fourthcoffee\User2.
By default, Outlook always tries the credentials that you use to log on to the computer first, in this case Fourthcoffee\User1. Therefore, this connection is considered successful. That is, the computer credentials for Fourthcoffee\User1. Then, Outlook tries to connect to the mailbox for Fourthcoffee\user2. Because the credentials for Fourthcoffee\User1 were successfully used during the Active Directory referral process, Outlook tries these same credentials to log on to the mailbox for Fourthcoffee\User2. Because Fourthcoffee\User1 does not have permissions to the mailbox for Fourthcoffee\User2, the mailbox logon fails. Access is denied. Because UseWindowsUserCredentials is set to 1 in this example, Outlook uses only the desktop credentials and suppresses the credentials prompt. Therefore, it silently fails repeatedly.