Date: Mon, 01 Dec 2014 04:23:47 -0800 From: Yuri <yuri@rawbw.com> To: freebsd-net@freebsd.org Subject: Can multiple apps listen for TCP on the same port? Message-ID: <547C5DD3.90604@rawbw.com>
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I have a simple 'nc' based TCP server with shell script serving http protocol. But when I run the second instance, it never gets any connections and never fails. 'nc -l PORT' first calls listen with backlog=1 and socket option SO_REUSEADDR, and then calls accept. Once client is accepted, it closes the listening socket and only works with this connection. Why the second nc instance still never accepts any connections, once the first connection is accepted, and first listening socket is closed? When one listening socket is closed, shouldn't other listening sockets on the same port be accepting connections? It looks like the whole port is blocked without even having the listening socket on it by one alive connection (which after it was accepted doesn't have much to do with the original port). Yuri
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