We’re Under Attack!
Posted by John Baez
Everybody listen up:
The n-Category Café is under attack by a trackback spambot. 
So, if you see an error message sort of like this:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
don’t assume your comment failed to go through! It probably did go through. Check before posting it over and over.
Tim Silverman adds:
And then wait a bit—like a quarter of an hour—and check again. Even after you get the error message, the server may still be trying to process your message (at least, I assume that’s what’s going on), so it may not appear for another few minutes.
Personally, in every case when I’ve gotten this warning message, the server actually posts my comments quite quickly. Your mileage may vary.
Jacques Distler is trying to address the problem.