Microsoft KB Archive/289858

= ISA Server Pass-Through Authentication Does Not Work with NTLM =

Article ID: 289858

Article Last Modified on 1/31/2007

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APPLIES TO


 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 4.01 Service Pack 1
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 3.02
 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Explorer 5.0
 * Microsoft Internet Explorer 4.01 Service Pack 1
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 5.5
 * Microsoft Internet Explorer 5.01
 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition

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This article was previously published under Q289858



SYMPTOMS
If you are using Internet Security and Acceleration (ISA) Server 2000 pass-through authentication with NTLM authentication as described in the &quot;Pass-Through Authentication&quot; section of the ISA Server documentation, you may receive the following error message in Internet Explorer:

HTTP 401.2 unauthorized - Logon failed due to Authentication Failure Internet Information Services



RESOLUTION
This problem was corrected in Internet Explorer 5.5 SP1.

To obtain the latest version of Internet Explorer, visit the following Microsoft Web site:

http://www.microsoft.com/windows/ie



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

Keywords: kberrmsg kbenv kbprb KB289858

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