Something awful happened to the server early this morning (US EST time) causing it to go completely unresponsive, even after reboot. I spent several hours attempting to set up a fallback site but by the time I got something working the hosting service had managed to bring it back online. I'm investigating the cause of the failure but until I understand more I'm going to back out some of the latest server changes I had made. Apologizes to anyone affected.
I'm adding 'set up a fallback server' to my todo list.