One of my servers has started to give out this error to anyone trying to upload using FrontPage extensions on the server. Uninstalling and reinstalling extensions on the domains did not work. The Microsoft support troubleshooting document (which was very short) did not resolve this issue. (Article 221769)
Any other suggestions would be appreciated. Again, this is globally occuring on all domains on this server. An identical server running the same versions of everything is not having this problem.