Stop node.js program from command line

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I have a simple TCP server that listens on a port.

var net = require("net");

var server = net.createServer(function(socket) {
    socket.end("Hello!\n");
});

server.listen(7777);

I start it with node server.js and then close it with Ctrl + Z on Mac. When I try to run it again with node server.js I get this error message:

node.js:201
        throw e; // process.nextTick error, or 'error' event on first tick
          ^
Error: listen EADDRINUSE
at errnoException (net.js:670:11)
at Array.0 (net.js:771:26)
at EventEmitter._tickCallback (node.js:192:41)

Am I closing the program the wrong way? How can I prevent this from happening?

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