Python Errno 98 Address already in use

Question

In my Python socket program  I sometimes need to interrupt it with Ctrl-C  When I do this  it does close the connection using socket close     However  when I try to reopen it I have to wait what seems like a minute before I can connect again  How does one correctly close a socket  Or is this intended

User · Answer

This happens because you trying to run service at the same port and there is an already running application.

This can happen because your service is not stopped in the process stack. Then you just have to kill this process.

There is no need to install anything here is the one line command to kill all running python processes.

for Linux based OS:

Bash:

kill -9 $(ps -A | grep python | awk '{print $1}')

Fish:

kill -9 (ps -A | grep python | awk '{print $1}')

User · Answer

Yes  it is intended  Here you can read detailed explanation  It is possible to override this behavior by setting SO REUSEADDR option on a socket  For example   sock setsockopt socket SOL SOCKET  socket SO REUSEADDR  1

User · Answer

First of all find the python process ID using this command  ps -fA   grep python   You will get a pid number by naming of your python process on second column  Then kill the process using this command  kill -9 pid

User · Answer

ps -fA   grep python 501 81211 12368   0  10 11PM ttys000    0 03 12   python -m SimpleHTTPServer    kill 81211

User · Answer

run the command  fuser -k  port number you are  trying to access  TCP   example for flask    fuser -k 5000 tcp  Also  remember this error arises when you interput by ctrl z  so to terminate use ctrl c

User · Answer

If you use a TCPServer  UDPServer or their subclasses in the SocketServer module  you can set this class variable  before instanciating a server    SocketServer TCPServer allow reuse address   True    via SocketServer ThreadingTCPServer - Cannot bind to address after program restart    This causes the init  constructor  to    if self allow reuse address       self socket setsockopt socket SOL SOCKET  socket SO REUSEADDR  1

User · Answer

Nothing worked for me except running a subprocess with this command  before calling HTTPServer      443   myHandler    kill -9   lsof -ti tcp 443    Of course this is only for linux-like OS

User · Answer

A simple solution that worked for me is to close the Terminal and restart it

[python] Python [Errno 98] Address already in use

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