I have an application running on a Windows Server 2003 SE, IIS6, and the .Net 2.0 Framework. Also all users use IE6, or 7. The application uses Windows Authentication. All works well with approx 100 users on a fairly lage network, with the exception of one user. When the user is authenticated on the client machine, they try to access the application. They are not challenged, and a 400 Bad Request error is returned.
In an effort to debug, I installed Fiddler to be able to see what the authentication headers are saying. The weird thing now is if fiddler is running it will pass the authentication along and load the default page properly. If Fiddler is not running, I get the 400 error, and the Auth tab says "no authorization header is present"
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