port timeout

I have an issue where it appears after 12 hours the UNIX side of a TCP
port which has been receiving "keepalive" messages from the PC side no
longer responds to that message. This causes the port to be closed as
far as I can tell. I have a port monitoring program on the PC and the
port goes away after 12 hours if the only traffic has been the
keepalive messages. If the port sends a real message within 12 hours,
the port does not close.

It works on several systems but doesn't work on another. I was
wondering if anyone could suggest some UNIX parameters I could look at
to see if there is some "12 hour" idle limit which would cause the UNIX
system not to respond..

I'd appreciate it if you could also email the reply to
esokol@xxxxxxxxxxx

Thanks in advance.
Elly

.

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