I get that message occasionally. Today it's because the server went down AGAIN. This is the third time this week after I changed the forum software as directed. I've been told so many different things by tech support I don't know who to believe at this point. I was told this time that the server needed to be rebooted and it wasn't my fault. Funny how I change the forum software at their insistence and the server crashes more times in four days than it did in the previous three weeks.
If this happens a few more times, I'm switching hosting service providers.