Why don't my sockets close?

  When you issue the close() system call, you are closing your interface
  to the socket, not the socket itself.  It is up to the kernel to close
  the socket.  Sometimes, for really technical reasons, the socket is
  kept alive for a few minutes after you close it.  It is normal, for
  example for the socket to go into a TIME_WAIT state, on the server
  side, for a few minutes.  People have reported ranges from 20 seconds
  to 4 minutes to me.  The official standard says that it should be 4
  minutes.  On my Linux system it is about 2 minutes.  This is explained
  in great detail in ``2.7 Please explain the TIME_WAIT state.''.

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