Access Control Causes Reverse Proxy to Fail (177154)


The information in this article applies to:

  • Microsoft Proxy Server 2.0
This article was previously published under Q177154

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

This problem is resolved in Microsoft Proxy Server 2.0 Service Pack 1 (SP1). For more information about Service Pack 1, please see the following article in the Microsoft Knowledge Base:

238375 Proxy Server 2.0 Service Pack 1: 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.
Modification Type:MajorLast Reviewed:12/6/2000
Keywords:kbbug kbFAQ KB177154
©2002 Microsoft Corporation. All rights reserved.