WindowsIdentity.AuthenticationType returns ""

[steve baker]

In the global.Application_AuthenticateRequest event I
check the Context.User.Identity.AuthenticationType to see
if our Application is using Windows Integrated security
or Forms. This worked great on a Windows 2000 Server,
however on a 2003 server, when accessing the web
application from the localhost, the AuthenticationType
returns an empty string. Note that the isAuthenticated
method is returning True.

Is there a change in the integrated security for 2003
server.

Context:

Anonymous access is disabled
Windows Integrated is enabled
Context.User.Identity.isAuthenticated = True
Context.User.Identity.AuthenticationType = ""