The server should never be down for more than a couple minutes, unless something happens that I'm powerless to correct (internet outage, blown power supply, etc.)
Most of the time, though, it goes down when somebody disconnects from it badly; in those cases it will spring back (like a Weeble!) - just give it a couple minutes and try again. I'm guessing that's what happened, unless my house burned down or something while I was out.
On a different subject, I take it this means you weren't Ulm?
Anybody want to fess up?