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The Transport Control Protocol (TCP) is a low-level part of the protocol stack used by the Internet. It sits directly above the IP layer and is responsible for making sure that dropped packets are resent.

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Listening to TCP port 0 allocates me a free port number on the system. But what happens when I try to connect to TCP port 0? The obvious answer is: "It doesn't work": $ nc localhost 0 … nc: port number too small: 0 Where in the system is this handled? In the TCP stack of the OS kernel? Are there Unixes where connecting to TCP port 0 would work? …
asked Jan 22 '15 by nh2