Error Message: HTTP 401.5 - Unauthorized: Authorization by ISAPI or CGI Application Failed

ID: Q248085

The information in this article applies to:

Microsoft Internet Information Services version 5.0
Microsoft Internet Information Server 4.0

SYMPTOMS

When you attempt to access an IIS Web site, the following error message may occur:

HTTP 401.5 - Unauthorized: Authorization by ISAPI or CGI application failed

CAUSE

The Web address has an ISAPI (Internet Server Application Programming Interface) or CGI (Common Gateway Interface) program that verifies user credentials. The authentication credentials used to connect to the server were denied access by this program.

RESOLUTION

To resolve this issue, attempt to access the server again using the appropriate credentials. Contact the system administrator to obtain the correct logon information.

Additional query words: IIS 5

Keywords : kbWinOS2000
Version : winnt:4.0,5.0
Platform : winnt
Issue type : kbprb