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Old 01-04-2010, 05:01 AM   #1
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how to close a socket and refuse waiting connections?


i've written a socket server. when i launch a client, it connects to servers running on various machines on my local network, which then reply to the client with some string messages, and the client exits.

however, when i launch the client repeatedly (say 5 or 6 times in quick succession) the client is unable to bind to its local port. this appears to be because servers are still trying to connect to the client machine's port, even though the client exited and shut the socket down. the actual error i receive is "Error binding socket to Address already in use".

so, is it enough just to shutdown and close a socket? is there some way that in doing so the client machine can send a CONNECTION_REFUSED message to any machine trying to connect to it? i am using PHP, not that that should make much of a difference i hope.

the problem resolves itself after around 20 seconds as the machines trying to connect to the client timeout. i still need to fix this issue though.


Last edited by hboosh; 01-04-2010 at 05:29 AM.
Old 01-04-2010, 02:34 PM   #2
Registered: Feb 2002
Location: Grenoble
Distribution: Debian
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After you close a server socket, you should wait a while (that's TCP feature). You can also set socket option to SO_REUSEADDR. Example usage and code here:
Old 01-05-2010, 02:59 AM   #3
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ok thanks. it's not going to be used in a super high availability environment, so it shouldn't cause a problem. i'm already using SO_REUSEADDR.


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