"Port 4200 is already in use". Killing all the processes associated with 4200 did not work.

Question

I'm trying to get angular running on my Mac OS X 10.11.3 El Capitan.

I installed nodeJS and npm. Through npm I installed angular-cli.

I created a new app via the command sudo ng new first-app

I navigated into the app folder and ran sudo ng serve.

It threw the following error :

Could not start watchman; falling back to NodeWatcher for file system events.
Visit http://ember-cli.com/user-guide/#watchman for more info.
Port 4200 is already in use.

With reference from another answer, I tried the following :

sudo kill $(sudo lsof -t -i:4200)

It did not help.

Actually, I have re-installed nodejs, npm, angular-cli. When I had installed it before there was some build error as there was some bower issue. Not sure what. When I accessed localhost:4200 that time, the page showed up but with the error log on it. Now the page doesn't even load. The loading symbol just keeps circling near the favicon. I don't know if this could be a lead.

Thanks. I need to get angular running pronto. Lots to learn !

score 18 · Answer 1 · answered Feb 23 '17 at 11:42

18

Please fire this one on git cmd

sudo lsof -t -i tcp:4200 | xargs kill -9

answered Feb 23 '17 at 11:42

H D Ahir

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probably not much upvotes because chrome is also killed hehe thx – steoiatsl Apr 19 '17 at 10:23
Thanks @LauraAbadAvilés – H D Ahir Jul 28 '17 at 04:11
1

Chrome was not killed on this but only ng serve! Thanks – BlackBurn027 Sep 27 '18 at 05:00

score 11 · Answer 2 · answered Feb 11 '17 at 11:33

11

Sometimes you need to kill process forcefully, use -9 for that

kill -9 $(lsof -t -i:4200)

answered Feb 11 '17 at 11:33

Freddy

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San Jaisy · Answer 3 · 2018-11-06T22:30:39.040

9

This help me. Kill the process on port 4200 on mac terminal

npx kill-port 4200

Then use

ng serve

Reference - Find (and kill) process locking port 3000 on Mac

edited Nov 06 '18 at 22:30

answered Aug 04 '18 at 03:04

San Jaisy

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Worked for me... after many other options that failed. Thanks San! +1 – Lucas Aug 11 '20 at 13:20

score 1 · Answer 4 · answered Sep 06 '16 at 06:36

1

Try seperatly executing your kill command. this how you do it.

run this command to get the proceess id who is using port 4320. in my example am showing you using mysql = 3360.

sudo ps -alh | grep "3360"

0  1000 20170 18854  20   0  14224  1092 pipe_w S+   pts/1      0:00 grep --color=auto 3360

then Execute kill command now:

sudo kill -s 18854

Done!

answered Sep 06 '16 at 06:36

Develop4Life

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501 73083 69535 4006 0 31 0 2445080 360 - T 0 ttys000 0:00.00 grep :4200 501 74143 69535 4006 0 31 0 2453272 804 - S+ 0 ttys000 0:00.00 grep 4200 I got this as the result. What should I do now ? Which is the signal ? All the values are coming as unknown signals. – Shoaib Ali C H Sep 06 '16 at 08:21
sudo kill -s 69535 or sudo kill -s 4006 – Develop4Life Sep 06 '16 at 08:23

score 1 · Answer 5 · answered Aug 19 '20 at 18:44

1

You can use

lsof -t -i tcp:4200 | xargs kill -9

it worked for me

answered Aug 19 '20 at 18:44

ron33

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score 0 · Answer 6 · edited May 27 '19 at 19:49

0

Try this:

fuser -n tcp -k 4200 -f

edited May 27 '19 at 19:49

venerik

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answered May 27 '19 at 19:02

Alen

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score 0 · Answer 7 · edited Jul 24 '20 at 06:46

For Windows user go to cmd as administrator and look up PID for the running port. For example my running port is 4200.

Then run this command on cmd

netstat -a -n -o

Find port with port number 4200 by lookingup in the list or you can right click on terminal and click find here enter 4200 in "find what" and click "find next": For example you found that port number 4200 is used by pid 17200 then type below command in cmd:

taskkill -f /pid 17200

"Port 4200 is already in use". Killing all the processes associated with 4200 did not work.

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