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I have a problem accessing my asp.net (and asp) pages since upgrading to Windows XP SP2. This is a problem only I seem to have (luckily no one else has it!) My pages use delegation as I am hitting SQL Server with the users credentials. I'm fairly confident this is set up properly (It has worked for months). Ever so often, when I try to hit my webserver (This never happens locally), I'll get hit with the error:

Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'.

I can't track down exactly why this is occurring, and even more why only I get it? I've at least done some detective work, and know my browser is sending out a Kerberos token, which I know is valid since I can authenticate with pages that do not require my delegation scenario. The token looks something like this in my server variables.

HTTP_AUTHORIZATION Negotiate TlRMTVNTUAADAAAAGAAYAHwA...(+hundreds more characters)

I really don't know why this is happening, why just I get it, and why it comes and goes without reason! Is there anything I can try/do to troubleshoot this problem? I would be most appreciative of any help!

--Michael