I'm using upnpd for clients using WiFi, in bad
conditions, so it often disconnects. It appears that,
if some clients disconnect while talking to the daemon,
upnpd stops working for the other clients.
With a netstat, you can see that there are unsent
packets (i.e. in the Send-Q list), that are NEVER sent.
The only way to fix this is to kill the daemon, and
launch it again. Doing this resets the connections that
were in the CLOSE_WAIT without ever properly closing.
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What daemon do you use where this behavior can be watched?