My server hung yesterday. I did not notice it; at this stage in the game, I should be much more aware... I looked into /var/log/messages and my last entry was: Feb 5 15:03:46 medon kernel: conntrack: generic helper won't handle protocol 47 . Please consider loading the specific helper module. So I don't know if someone knocked me over with a GRE based attack, if the drive is bad, if the board is bad, or the OS has a problem. So simple things to start with. I see an earlier GRE warning in messages: Feb 5 03:29:49 medon kernel: conntrack: generic helper won't handle protocol 47. Please consider loading the specific helper module. So it is probably not a stack problem with attacking GRE bots. BTW, is there some 'easy' way to just block these? As to the drive: Is there some way to run a SMART? check on the drive? Can't really tell too well if it is a board problem other than to watch more closely to see how things go, is there anywhere else I should look to find the problem? thanks