courier-imapd disconnecting and leaving stale connections

[Gerald Combs]

Jack wrote:
> Ok, this is more an annoyance than anything else. I 
> suspect I have something missing in my configuration
> for courier. Frequently while I have an imap session
> up
> it will disconnect at the server and leave the
> connection 
> process up on the server. This prevents my email
> client 
> from downloading anymore messages until I either close
> the email client, and the browser if it is Mozilla/ 
> Thunderbird. Or by kill -SIGHUP of the offending 
> process. I'm forcing imap over a secure connection and
> using a 9xx port. This doesn't happen with local
> connection that squirrelmail uses. Anyone experience
> similar behavior? Google was no help, or I didn't ask
> the right question.

If the server disconnects the session it shouldn't leave connection
process up and running, since there's no reason to keep it around.  Are
your remote clients connecting through a firewall?  Is it possible that
a NAT entry is expiring somewhere unbeknownst to the server and client?