Access Control Causes Reverse Proxy to Fail

ID: Q177154

The information in this article applies to:

SYMPTOMS

When Basic or Microsoft Windows NT Server Challenge Response authentications are enabled on the WWW service, and Access Control is selected (enabled) on the Web Proxy service, a reverse proxy to an internal web server will fail.


CAUSE

The Proxy Server tries to validate the Internet user and sends back the Proxy Authentication header that the browser is not designed to recognize. Therefore, the user will be prompted for username and password three times, then access will be denied, regardless of what username the user enters.


RESOLUTION

To resolve this problem, obtain the Microsoft Proxy Server 2.0 Combined Hotfix by contacting Microsoft Product Support Services. The combined hotfix is described in the KB article below:

Q190997 Proxy Server 2.0 Combined Hotfix Information and List of Fixes


WORKAROUND

Use one of the following methods to work around this problem:

Disable Access Control for the Web Proxy service.

-OR-

Locate the Web site on the WWW service on the Proxy Server.


STATUS

Microsoft has confirmed this to be a problem in Microsoft Proxy Server version 2.0.

Additional query words: frequently asked questions faq 


Keywords          : prx2faq kbfaq 
Version           : winnt:2.0
Platform          : winnt 
Issue type        : kbbug

Last Reviewed: August 9, 1999