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...set that on the client (DOS) side (the box which is using the same local port 1025 each time); setting it on the bound-listener socket on the Linux side doesn't seem like it would do anything to resolve the issue, based on my reading of SO_REUSEADDR on the net: http://www.unixguide.net/network/socketfaq/4.5.shtml http://stackoverflow.com/questions/14388706/ -G. -- Glenn Eychaner (geychaner at lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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