SharePoint Returning a 401.1 for a Specific User/Computer

Posted by Joe Gennari on Stack Overflow See other posts from Stack Overflow or by Joe Gennari
Published on 2010-06-10T19:20:30Z Indexed on 2010/06/10 19:22 UTC
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We have a SharePoint Services 3.0 site set up supporting about 300 users right now. This report is isolated and has never been duplicated. We have one AD user who cannot log into the SharePoint site with his account from his machine and is subsequently returned a 401.1 error.

If any other user tries to log on with their account from his machine, it works okay. If he moves to another machine and logs on, it works okay. The only solution to this point has been to install FireFox on the machine. When he authenticates with FF, everything is okay.

Remedies tried so far:
Cleared cookies/cache
Turned off/on Integrated Windows Authentication in IE
Downgraded IE 8 to IE 6
Removed site from Intranet Sites zone
Renamed the machine
Disjoined/Rejoined Domain

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