Microsoft KB Archive/171778

= Proxy Server Does Not Correctly Authenticate DPA =

Article ID: 171778

Article Last Modified on 9/23/2005

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APPLIES TO


 * Microsoft Proxy Server 1.0 Standard Edition
 * Microsoft Internet Information Server 3.0

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This article was previously published under Q171778





SYMPTOMS
When you use Microsoft Distributed Password Authentication (DPA) instead of Microsoft NTLM Authentication on Microsoft Proxy Server, users that are allowed access to the proxy server will be granted access. However, users that are not members of the group that has been granted access to the Proxy Server will experience a looping condition on browser.

Administrators of the Proxy Server will see log files grow rapidly and will notice that the Proxy Server is busy trying to authenticate user logon requests.



CAUSE
Proxy Server was not designed to use Microsoft Distributed Password Authentication.



WORKAROUND
Microsoft Proxy Server has been fixed to provide support for Microsoft Distributed Password Authentication. The fix is installed by stopping all of the Microsoft Internet Information Server (IIS) Services that may be running on the Proxy Server and replacing the W3proxy.dll file.



STATUS
Microsoft has confirmed this to be a problem with Microsoft Proxy Server version 1.0. This problem was corrected in the latest U.S. Service Pack for Microsoft Windows NT version 4.0. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: proxy dpa mcis

Keywords: kbhotfixserver kbqfe kbbug KB171778

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