Django Server Error: port is already in use

Question

Restarting the Django server displays the following error:

this port is already running....

This problem occurs specifically on Ubuntu and not other operating systems. How can I free up the port to restart the server?

Dont use ctrl+z to stop server. As mentioned here https://askubuntu.com/a/510816 `Control+Z` shunts it into the background, suspended. That is why your port is already in use. — Muzaffer, May 21 '21 at 08:07
Use `Control+C` instead. From the [askubuntu link](https://askubuntu.com/a/510816) above posted by @Muzaffer : `Control+C` aborts the application almost immediately `Control+Z` shunts it into the background, suspended — Mue, Jan 23 '23 at 21:00

Mounir · Accepted Answer · 2015-11-17T12:49:03.977

783

A more simple solution just type sudo fuser -k 8000/tcp. This should kill all the processes associated with port 8000.

EDIT:

For osx users you can use sudo lsof -t -i tcp:8000 | xargs kill -9

edited Nov 17 '15 at 12:49

answered Nov 27 '13 at 10:53

Mounir

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On mac you need to use `sudo lsof -i tcp:8000` then kill the process ids that show up. – gordonc Jan 21 '15 at 13:24
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So whatever the port is just replace 8000 with the port the block occurs. – Manish Shrivastava Dec 19 '16 at 16:02
I'm getting this error, but I have killed everything on the port. – wanderer0810 Sep 08 '17 at 23:52
Works! On mac: sudo lsof -i tcp:8000 – Wim den Herder Nov 19 '21 at 20:59
Please don't recommend `kill -9` as a routine solution. The `-9` option is unmaskable and will prevent the process from clean up after itself; it should really only be used if nothing else works. – tripleee Dec 03 '21 at 13:36
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I come like everyday to copy and past in my terminal. THANKS – zaman Jul 11 '22 at 14:07
for ubuntu user `sudo fuser -k 8000/tcp` – Jawad Hussain Shah Feb 04 '23 at 17:02
Thank your for the OSX command. Saved a lot of time! :-) – Andy Duncan Mar 22 '23 at 14:42

score 79 · Answer 2 · answered Jan 16 '16 at 06:29

netstat -ntlp

It will show something like this.

   Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State           PID/Program name    
tcp        0      0 127.0.0.1:8000          0.0.0.0:*               LISTEN      6599/python         
tcp        0      0 127.0.0.1:27017         0.0.0.0:*               LISTEN      -                   
tcp        0      0 192.168.124.1:53        0.0.0.0:*               LISTEN      -                   
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      -                   
tcp6       0      0 :::3306                 :::*                    LISTEN

So now just close the port in which Django/python running already by killing the process associated with it.

kill -9 PID

in my case

kill -9 6599

Now run your Django app.

If anyone struggles with this in the future, I've checked the processes using the specified port using the command `$ sudo lsof -i tcp:8000` from gordonc's comment in Mounir's answer, and then ussed the command in this answer to kill it. Can runserver in python without issue after that. — Seb, Nov 01 '21 at 04:05

Ashish Kumar Saxena · Answer 3 · 2013-11-27T10:28:41.420

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ps aux | grep -i manage

after that you will see all process 


ubuntu@ip-10-154-22-113:~/django-apps/projectname$ ps aux | grep -i manage
ubuntu    3439  0.0  2.3  40228 14064 pts/0    T    06:47   0:00 python manage.py runserver project name
ubuntu    3440  1.4  9.7 200996 59324 pts/0    Tl   06:47   2:52 /usr/bin/python manage.py runserver project name
ubuntu    4581  0.0  0.1   7988   892 pts/0    S+   10:02   0:00 grep --color=auto -i manage


kill -9 process id


e.d kill -9 3440


`enter code here`after that :

python manage.py runserver project name

edited Nov 27 '13 at 10:28

answered Nov 27 '13 at 10:03

Ashish Kumar Saxena

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So you try to start the server again, while one is already running? That won't work as the first one will be using the HTTP port. You must kill or terminate the first one, before trying to run again (at least run it on the same port). – Some programmer dude Nov 27 '13 at 10:05
It's working because you killed the currently running instance, which is what I said you have to do. You can't have two programs listening on the same network port, it's as easy as that. So this is a solution to something that isn't really a problem, just a fact. – Some programmer dude Nov 27 '13 at 10:10
I'm sorry if I might have been coming on to strong, I'm just feeling a little grumpy today. :/ – Some programmer dude Nov 27 '13 at 10:20

score 13 · Answer 4 · edited Oct 31 '18 at 01:37

13

By default, the runserver command starts the development server on the internal IP at port 8000.

If you want to change the server’s port, pass it as a command-line argument. For instance, this command starts the server on port 8080:

python manage.py runserver 8080

edited Oct 31 '18 at 01:37

Stephen Rauch

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answered Oct 31 '18 at 01:15

Freddy

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@StephenRauch, the question does not ask WHO is using the port. The question is stating an error being thrown. This is a solution on how to fix that error. – Freddy Nov 01 '18 at 18:38
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The OP is asking how to restart the server on port 8000, not asking for running it on another port – uclaastro Jan 23 '20 at 06:32

score 13 · Answer 5 · edited Mar 11 '21 at 14:01

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

edited Mar 11 '21 at 14:01

Samsul Islam

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answered Feb 04 '20 at 06:14

Nandy

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Don't routinely recommend `kill -9`; it should only be used as a last resort in desperate situations. – tripleee Dec 03 '21 at 13:33

score 6 · Answer 6 · edited Sep 14 '21 at 17:58

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>> ps aux | grep manage

 ubuntu    3438  127.0.0  2.3  40256 14064 pts/0    T    06:47   0:00 python manage.py runserver

>> kill -9 3438

edited Sep 14 '21 at 17:58

Antu

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answered Sep 04 '17 at 17:40

Basant Rules

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While this code snippet may solve the question, [including an explanation](//meta.stackexchange.com/questions/114762/explaining-entirely-code-based-answers) really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. Please also try not to crowd your code with explanatory comments, this reduces the readability of both the code and the explanations! – rene Sep 04 '17 at 17:42

score 6 · Answer 7 · answered Feb 23 '20 at 12:28

6

Sorry for comment in an old post but It may help people

Just type this on your terminal

killall -9 python3

It will kill all python3 running on your machine and it will free your all port. Greatly help me when to work in Django project.

answered Feb 23 '20 at 12:28

Antu

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This is extremely hamfisted for anyone who might be running Python for _any_ other reason. – tripleee Dec 03 '21 at 13:34
I already mention that `it will kill all python3 running on your machine` – Antu Dec 04 '21 at 04:01
Those who are the most likely to try this without properly understanding it will probably also not understand that point without further elaboration. – tripleee Dec 04 '21 at 07:08

score 5 · Answer 8 · answered Jul 10 '17 at 11:33

We don't use this command { sudo lsof -t -i tcp:8000 | xargs kill -9 } Because it's close all tabs...You should use to

ps -ef | grep python

kill -9 process_id

ps -ef | grep python (show all process with id)

kill -9 11633 (11633 is a process id to :- /bin/python manage.py runserver)

score 5 · Answer 9 · edited Mar 11 '21 at 14:02

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Type 'fg' as command after that Ctrl-C.
Command:
Fg will show which is running on background. After that Ctrl-C will stop it.

fg
ctl-c

edited Mar 11 '21 at 14:02

Samsul Islam

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answered Nov 26 '19 at 00:15

mahbubcseju

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That was really helpful, Thanks! – Miriam Arbaji Oct 18 '21 at 07:14
The simplest and most helpful answer. – Kadir Şahbaz Feb 17 '23 at 05:16
This seems to be the most simple way to adress the OP's issue. It works, but it would be interesting to know why. Isn't the process running in the foreground already? – CRuizH Aug 03 '23 at 15:53

score 4 · Answer 10 · answered Feb 28 '22 at 09:03

In terminal, Type ps aux | grep runserver
Hit Enter
Use PID among the result execute kill -9 <PID>

For an instance, If result of step 1 is as follow

root      1041  0.0  0.1 266912 34580 pts/3    S+   11:31   0:01 python3 manage.py runserver 0.0.0.0:3030
root      1696  4.5  0.1 126128 40708 ?        S    Feb14 925:43 /usr/local/bin/python manage.py runserver 0.0.0.0:8000

1041 and 1696 are PIDs. We need to choose whichever process we want to kill among them.

score 2 · Answer 11 · answered Nov 25 '14 at 23:11

This is an expansion on Mounir's answer. I've added a bash script that covers this for you. Just run ./scripts/runserver.sh instead of ./manage.py runserver and it'll work exactly the same way.

#!/bin/bash

pid=$(ps aux | grep "./manage.py runserver" | grep -v grep | head -1 | xargs | cut -f2 -d" ")

if [[ -n "$pid" ]]; then
    kill $pid
fi

fuser -k 8000/tcp
./manage.py runserver

score 2 · Answer 12 · answered Aug 05 '20 at 19:38

2

Click the arrow in the screenshot and find the bash with already running Django server. You were getting the message because your server was already running and you tried to start the server again.

answered Aug 05 '20 at 19:38

Python Newbie

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score 1 · Answer 13 · answered May 15 '19 at 14:30

For me, this happens because my API request in Postman is being intercepted by a debugger breakpoint in my app... leaving the request hanging. If I cancel the request in Postman before killing my app's server, the error does not happen in the first place.

--> So try cancelling any open requests you are making in other programs.

On macOS, I have been using sudo lsof -t -i tcp:8000 | xargs kill -9 when I forget to cancel the open http request in order to solve error = That port is already in use. This also, complete closes my Postman app, which is why my first solution is better.

score 1 · Answer 14 · answered Jan 17 '22 at 05:24

Dont use CTRL + Z to stop server, use CTRL + C to stop the server, I had also had the same problem in my linux (fedora) , I used to stop the server using CTRL + Z and again I used to kill the server using sudo fuser -k 8000/tcp command, which worked fine. But later when I started using CTRL + C , I didnot get that port running issue anymore.

score 0 · Answer 15 · answered Feb 01 '20 at 19:43

0

if you have face this problem in mac you just need to open activity monitor and force quite python then try again

answered Feb 01 '20 at 19:43

Ahmed Safadi

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score 0 · Answer 16 · answered May 14 '20 at 07:57

In case You are using the VSC's screen terminal, The error might be due to the fact that you already runserver in some other shell.

Just click on the dropbox on the left of the + sign in the header of the terminal of VSC and select some other shell and check if the server is already running there. Quit that server and you are ready to launch a another server.

score 0 · Answer 17 · answered Oct 02 '22 at 10:27

0

I was trying all the solutions but they were not working i suggest you to keep press the power button or if your battery is removeable then remove it all the process will be killed and your local host will be reset

answered Oct 02 '22 at 10:27

hassan

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Django Server Error: port is already in use

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