[Zope] ZServer going down ??

Hello, my zserver is often going down. this is my nohup.out-log on linux red hat. Any Idea ????? 2000-09-12T15:27:17 ERROR(200) ZServer uncaptured python exception, closing chan nel <zhttp_channel connected 213.20.58.238:1043 at 872d7d0 channel#: 600 request s:1> (socket.error:(9, 'Bad file descriptor') [/usr/local/dc/Zope-2.1.4-linux2-x 86/ZServer/medusa/asynchat.py|initiate_send|211] [/usr/local/dc/Zope-2.1.4-linux 2-x86/ZServer/medusa/http_server.py|send|400] [/usr/local/dc/Zope-2.1.4-linux2-x 86/ZServer/medusa/asyncore.py|send|237])