How to fix Error: listen EADDRINUSE while using NodeJS?

Question

If I run a server with the port 80, and I try to use XMLHttpRequest I am getting this error: Error: listen EADDRINUSE

Why is it problem for NodeJS, if I want to do a request, while I run a server on the port 80? For the webbrowsers it is not a problem: I can surf on the internet, while the server is running.

The server is:

  net.createServer(function (socket) {     socket.name = socket.remoteAddress + ":" + socket.remotePort;     console.log('connection request from: ' + socket.remoteAddress);     socket.destroy();   }).listen(options.port); 

And the request:

var xhr = new XMLHttpRequest();  xhr.onreadystatechange = function() {     sys.puts("State: " + this.readyState);      if (this.readyState == 4) {         sys.puts("Complete.\nBody length: " + this.responseText.length);         sys.puts("Body:\n" + this.responseText);     } };  xhr.open("GET", "http://mywebsite.com"); xhr.send(); 

Answer 1

What really helped for me was:

killall -9 node 

But this will kill a system process.

With

ps ax 

you can check if it worked.