Fixing the error: socket.error: [errno 98] address already in use

Question

I get the “socket.error: [errno 98] address already in use” issue when trying to setup application.py. Here is the detail of the error I got the error message:

Traceback (most recent call last):
 File "application.py", line 121, in <module>
 main()
 File "application.py", line 117, in main
 http_server.listen(options.port)
 File "/usr/local/lib/python2.7/site-packages/tornado-3.1-py2.7.egg/tornado/tcpserver.py", line 117, in listen
 sockets = bind_sockets(port, address=address)
 File "/usr/local/lib/python2.7/site-packages/tornado-3.1-py2.7.egg/tornado/netutil.py", line 90, in bind_sockets
 sock.bind(sockaddr)
 File "/usr/local/lib/python2.7/socket.py", line 224, in meth
 return getattr(self._sock,name)(*args)
 socket.error: [Errno 98] Address already in use

Please give me some advice to solve this problem.

hdtutoria · Accepted Answer

The cause: This error happens perhaps because another process is plainly listening on the port. The solution: To fix this error, you can use the following command:

$ lsof -i :8000

or change the port of your Tornado app.

Arthur Foulon · Answer

It is likely that another process is listening to the port. This command might help you find that process:

$ lsof -i :8000

or change your tornado app's port. This is explicit information about the tornado's errors.

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Fixing the error: socket.error: [errno 98] address already in use