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

User · Answer

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

User · Answer

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

User · Answer

lsof -t -i tcp 8000   xargs kill -9

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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

User · Answer

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

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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

User · Answer

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

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It seems that IDEs  VSCode  Puppeteer  nodemon  express  etc  causes this problem  you ran a process in the background or just closed the debugging area  browser  terminal  etc    or whatever   anyway  i have answered same question before  Here you are it s link  https   stackoverflow com a 49797588 2918720

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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

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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

User · Answer

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

User · Answer

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

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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

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Type  fg  as command after that ctl-c  Command  Fg will show which is running on background  After that ctl-c will stop it      fg   ctl-c

User · Answer

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

User · Answer

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

[python] Django Server Error: port is already in use

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