When I try to run my angular app using command
ng serve -o --port 4200
it shows the error like,
Port 4200 is already in use , try different port
But I checked that, there is no running process in that port using this command
sudo lsof -i -P -n | grep LISTEN
I have also tried different ports but result is same showing that port is also in use.
When I tried dynamic port selection command ( --port 0 ) the app runs . But I must have to specify the port number.
I am using
Node version - 8.12.0
Angular version - 5.2.6
Angular CLI version - 1.7.1
Had the same problem, it's a bad version of portfinder. Until they fix it, specify directly in devDependences:
"portfinder": "1.0.20",
If you get this error: ‘Port 4200 is already in use. Use ‘–port’ to specify a different port’, you might have left your Angular development environment without closing the node.js webserver’s port.
Here’s how you can close it without having to reboot your computer or change your application’s port.
Step 1: Find the connection’s PID
netstat -ano | findstr :yourPortNumber
Example with its output:
netstat -ano | findstr :4200
and output is :
TCP 127.0.0.1:4200 0.0.0.0:0 LISTENING 10764
Step 2: Kill the process using it’s PID
tskill yourPID
Example:
tskill 10764
Step 3: Restart your server
You should be able to run it (using ng serve)
Step 4: Stop your server properly
Don’t forget now to close properly your server by using Ctrl + C and typing Y:
That’s it.
Try to remove --port 4200. By default angular cli will serve your angular app in port 4200.
Odds are you have a server running somewhere. This can happen when you quit a terminal window without stopping the server, for example. Open a task manager, and kill any Node processes. That should clear things up. Restarting your computer should accomplish the same thing.
