I was working with Greg’s authentication samples at work and I discovered a very irritating behavior with IIS on XP Professional. It seems that Digest Authentication is on by default, and the management UI doesn’t allow you to shut it off.

After some experimentation (and Greg’s suggestion), I determined that you can use the IIS ADSI interface to shut off Digest. Here’s a little bit of VBScript that does the trick on the root of the site: […]

[Gordon Weakliem’s Radio Weblog]

Thanks for posting this, Gordon.  It’s worth noting that this behavior only occurs on Windows XP machines that are members of a domain; stand-alone machines do not have the problem.  I have updated the original article with this info.