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When I close the socket on one end of a connection, the other end gets an error the second time it sends data, but not the first time: import socket server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.bind(("localhost", 12345)) server.listen(1) client = socket.create_connection(("localhost",12345)) sock, addr = server.accept() sock.close() client.sendall("Hello World!") # no error client.sendall("Goodbye World!") # error happens here I've tried setting TCP_NODELAY, using send instead of sendall , checking the fileno() , I can't find any way to get the first send to throw an error or even to detect afterwards that it failed. EDIT: calling sock.shutdown before sock.close doesn't help. EDIT #2: even adding a time.sleep after closing and before writing doesn't matter. EDIT #3: checking the byte count returned by send doesn't help, since it always returns the number of bytes in the message. So the only solution I can come up with if I want to detect errors is to follow each sendall with a client.sendall("") which will raise an error. But this seems hackish. I'm on a Linux 2.6.x so even if a solution only worked for that OS I'd be happy.

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