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...hat the DOS box has disappeared again, and drop its conn. By the time the DOS box reboots, TIME_WAIT may have expired, so the DOS box might reconnect without a problem. You may wish to reduce tcp_fin_timeout to ensure that TIME_WAIT does indeed expire before the DOS box reboots, per http://goo.gl/zQCzqK

I will try to explain this as best I can. I have two computers; one a Supermicro X10SAE running CentOS 6, the other a very old DOS box.[*] The DOS box runs a CCD camera, sending images via Ethernet to the X10SAE. Thus, the X10SAE runs a Python server on port 5700 (a socket which binds to 5700 and listens, and then accepts a connection from the DOS box; nothing fancy).[**] The DOS box connects to