Microsoft KB Archive/252941

Knowledge Base

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

Article ID: 252941

Article Last Modified on 12/3/2007

---

APPLIES TO

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

---

This article was previously published under Q252941

SYMPTOMS

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.

CAUSE

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

RESOLUTION

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

MORE INFORMATION

For more information, refer to the following:

• In the IIS 5 Documentation, refer to the following topic:

    Administration
      Server Administration
        Security
          Authentication
            About Authentication
                          

• IIS 4.0 and 5.0 Authentication Methods Chart

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

Keywords: kbprb kbpending KB252941

---

Send feedback to Microsoft

© Microsoft Corporation. All rights reserved.