The NOC/Data Center had to reboot the server unexpectedly, due to an issue with the back-end. They reported they do not anticipate the downtime to last past 30 minutes, and that was 1.25 hours ago.
I'll keep on them until this issue is resolved. Thank you for your patience.
EDIT: And we're back up. Apparently there was a problem with quotas and the filesystem quotas had to all be recalculated before the machine could be brought back up and into service.
Again, we apologize for the inconvenience, we had no advance knowledge this would happen or we would have notified all users.