I've got Seti@home running on Red Hat 7.1, in the background.
When it completes a data packet, the Seti client is never able to
connect to the server to upload the results, unless I kill and restart
that process, or reboot the machine.

This has been happening for over a year- so I'm pretty sure it's not
that the server is too busy. I also run setiathome on many windows
machines where I work, and they have no problem connecting to the
server, and uploading the results.

Can anyone give me a clue as to what the problem is ?

thanks