NTLM Enabled on IIS 1.0 Creates Problems with Run-Time Bots

• Microsoft Internet Information Server version 1.0
• Microsoft FrontPage for Windows 1.1
• Microsoft Windows NT Server version 3.51

SYMPTOMS

When you run Microsoft FrontPage for Windows version 1.1 on Windows NT Server version 3.51 with Internet Information Server 1.0 installed, you will not be able to use NTLM Authentication, and you may receive an error message similar to the following:

   HTTP/1.0 500 Server Error
   (The type of the token is inappropriate for its attempted use.)

CAUSE

Even though NTLM cannot be used to access CGI scripts on Windows NT Server 3.51, IIS 1.0 tells the browser that NTLM is okay. The browser, not being able to distinguish between a CGI script or an ISAPI script, unsuccessfully tries to use NTLM, and the result is the preceding HTTP error message.

RESOLUTION

To avoid the problem, use any of the following workarounds:

   Disable NTLM Authentication for the server.

   -or-

   Turn Allow Anonymous back on.

   -or-

   Upgrade the server to Microsoft Windows NT 4.0 and Internet Information
   Server 2.0, which is capable of handling NTLM access to CGI scripts.