Authentication Issue with NTLM Security on IIS If User Name or Password Contains Extended Characters

You cannot be successfully authenticated when you try to gain access to a page on a computer that is running Microsoft Internet Information Server (IIS) that is configured to use NTLM security if your user name or password contains an extended character (for example, an N with a tilde character above it).

You can log on to the Microsoft Windows NT-based domain and gain access to network resources, but when you try to gain access to a page on the IIS server from Internet Explorer, you are prompted three times for your credentials, and then you receive HTTP error 401.

Internet Explorer 5.5

To resolve this problem, obtain the latest service pack for Internet Explorer 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Internet Explorer 5.01

To resolve this problem, obtain the latest service pack for Internet Explorer version 5.01. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

The authentication succeeds if you configure IIS to use Basic/Clear Text authentication or Secure Sockets Layer (SSL).

Internet Explorer 5.5

Microsoft has confirmed that this is a problem in Internet Explorer 5.5. This problem was first corrected in Internet Explorer version 5.5 Service Pack 1.

Internet Explorer 5.01

Microsoft has confirmed that this is a problem in Internet Explorer 5.01. This problem was first corrected in Internet Explorer version 5.01 Service Pack 2.