I have set up webdav in IIS 6 on a 64 bit 2003 server. It works fine with an anonymous user but I need to ask for a username and password everytime and allow upload and download. I have even opened a case with Microsoft and they haven't figured it out yet. I have just discovered that it works fine from Windows 2000 machines but not XP sp2 or sp3. Could this be a difference in 2000's worldwideweb publshing service versus the XP webclient service? Microsoft says IIS looks right and I tend to believe them because it works fine from a 2000 machine. I am getting desperate on this one.
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