I have this problem too!
CheckConnectionAttempt: Error while checking socket status.
NotifyAcceptingConnection: Server MyLevel accept
Also after a player connects:
Connection timed out after 120.000000 seconds (120.043142)
Close TcpipConnection3 Sat Sep 22 15:05:38 2012
The server ran ok but suddenly I get these messages and the server is not running stable anymore.