The webserver is running FreeBSD, and currently I get many FIN_WAIT_2 states:
# netstat -n -p tcp | grep FIN_WAIT_2 | wc -l
48
I wonder WHAT is responsible for sending every 5 minutes ACK messages to the clients in FIN_WAIT_2 state? tcp.inet.tcp.always_keepalive seems to be something else
The TCP stack wants the remote end to acknowledge the last FIN it sends and close the connection cleanly, and there is a timer (2 * MSL?) which gets started when a connection moves into the closing stages (FIN_WAIT_1, FIN_WAIT_2, LAST_ACK).
It's not uncommon for some clients (think dialup users running Win98), to drop the connection rather rather than close it properly. Your system should time out these connections after a while.
-- -Chuck
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