IE (version 11 Win7) on one client computer gets a 501 error for this pre-release link for their review
i cannot reproduce on any other computer.
It's not an IP block because other computers can display the site.
once the 501 error is encountered, it seems to be computer-side DNS cache- related
since ANY URLs with that domain name cause the 501 error, in any browser on THAT computer.
the server is apache-based, so we tested the http://anotherdomain.com/~butTheirUsername
URL and that worked once, but then a second viewing of the same page caused 501 for
anything related to that http://anotherdomain.com
URL web root.
we think running CCleaner somehow cleared the domain situation, at least once, but are not sure
(i'm not there, and information is sketchy)
any ideas what could be triggering this situation?