Microsoft KB Archive/220964

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XWEB: Error Access Outlook Web Access - "HTTP error 500 (-2891763)"

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Q220964

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The information in this article applies to:


 * Microsoft Exchange Active Server Components, version 5.0
 * Microsoft Outlook Web Access, version 5.5
 * Microsoft Outlook Web Access, version 5.5 Service Packs 1, 2, 3

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SYMPTOMS
When you attempt to log onto your mailbox using the Outlook Web Access (OWA) client, you may encounter the following error message after entering your logon name:

HTTP error 500 (-2891763)

CAUSE
This only occurs when NT Challenge Response is enabled in addition to Basic (Clear Text) in the Microsoft Internet Information Service (IIS) authentication methods, and only if IIS 2.0 was never installed. Installing IIS 3.0, then upgrading to IIS 4.0 will cause this error with OWA.

RESOLUTION
Remove IIS 4.0, then install IIS 2.0 from the Windows NT 4.0 Server CD, and upgrade it to IIS 3.0, then 4.0, depending upon your needs.

WORKAROUND
Disabling NT Challenge Response as an authentication method in IIS manager will prevent this error from being displayed.

STATUS
Microsoft has confirmed this to be a problem in the Microsoft products that are listed at the beginning of this article.

Additional query words:

Keywords :

Issue type : kbbug

Technology : kbOutlookSearch kbZNotKeyword6 kbExchangeSearch kbZNotKeyword2 kbOWASearch kbOWA550 kbOWA550SP1 kbOWA550SP2 kbOWA550SP3 kbExchangeActiveServComp500