Python [Errno 98] Address already in use

If you use a TCPServer, UDPServer or their subclasses in the socketserver module, you can set this class variable (before instantiating 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)

$ ps -fA | grep python
501 81211 12368   0  10:11PM ttys000    0:03.12  
python -m SimpleHTTPServer

$ kill 81211

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!

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

This happens because you trying to run service at the same port and there is an already running application.
it can happen because your service is not stopped in the process stack. you just have to kill those processes.

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}')

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

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

sudo pkill -9 python

try this command

I had the same problem (Err98 Address already in use) on a Raspberry Pi running python for a EV charging manager for a Tesla Wall Connector. The software had previously been fine but it stopped interrogating the solar inverter one day and I spent days thinking it was something I’d done in python. Turns out the root cause was the Wifi modem assigning a new dynamic IP to the solar inverter as as result of introducing a new smart TV into my home. I changed the python code to reflect the new IP address that I found from the wifi modem and bingo, the issue was fixed.

I faced similar error at odoo server and resolved that with these simple following steps:

1. Paste following code in terminal

   ps -fA | grep python

You will get a pid number. Now copy the pid number from second column of terminal output.

2. Then write as below

   kill -9 pid

The terminal will restart and then the command

flask run

Will work fine!
Thank you

For Linux,

ps aux | grep python

This will show you the error. The process number (eg.35225) containing your python file is the error.

Now,

sudo kill -9 35225

This will kill the error process and your problem will be solved.

Do nothing just wait for a couple of minutes and it will get resolved. It happens due to the slow termination of some processes, and that’s why it’s not even showing in the running processes list.

Got this error after I ran my code while programming a Pico W via Thonny. At the command line just do a socket.reset() to clear the issue.

>>> socket.reset()

The cleanest way to make the socket immediately reusable is to follow the recommendation to first shutdown the client end (socket) of a connection, and make sure the server’s end shuts down last (through exception handling if needed).

This might well mean that the server end runs forever.

This is not a problem if that "forever" loop pauses execution, e.g. read from socket.

How you "break" that "forever" loop is up to you as server admin, as long as there are no clients (apart from obvious system level exceptions)

I tried the following code to settle the issue:

sudo lsof -t -i tcp:8000 | xargs kill -9