There is an apparent issue with IIS when the following situation occurs:
* A vdir has default content page enabled (which is the default, look under
documents tab)
* the vdir uses basic authentication
* the vdir's application configuration has a wildcard application map
defined
under these conditions, the basic authentication base64 encoded user:pwd
information normally found the http headers via Request.Headers and
Request.ServerVariables is not there.
-LZ