Microsoft KB Archive/252941

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No "Windows NT Challenge/Response" Authentication Method Available in IIS 5.0 and Later

Article ID: 252941

Article Last Modified on 12/3/2007


  • Microsoft Internet Information Services 5.0
  • Microsoft Internet Information Services 6.0

This article was previously published under Q252941


In Internet Information Server (IIS) 4.0, Windows NT Challenge/Response (also known as NTLM) was listed as an authentication method on the Directory Security tab of a Web site. In IIS 5.0 and later, however, this authentication method is not listed.


In IIS 5.0 and later, NTLM is referred to instead as Integrated Windows authentication.


Use Integrated Windows authentication as you would have used NTLM in IIS 4.0.


For more information, refer to the following:

Additional query words: iis 5 iis 6.0 iis6 challenge-response Challenge\Response nt lanman akz

Keywords: kbprb kbpending KB252941