Port 4200 is already in use

[svparijs]

Since a few days now my Mac cannot start ember serve properly.

 ❯ ember -v                                                                                                                     [14:08:43]
ember-cli: 3.4.4
node: 8.15.1
os: darwin x64

When I start a completely new ember project this also happens:

 ❯ ember server                                                                                                                [14:28:56]
Port 4200 is already in use.

Any idea's how to fix this?

[HEYGUL]

Can you run this terminal command:
lsof -i :4200

It will list any process which have already open 4200 port on your Mac.

[svparijs]

Yeah I've done a bit of googling to and did this aswel.

 ❯ lsof -i :4200                                                                                                               [15:00:52]

After running this:

ember serve --port 0

The new app works, again with the regular ember serve command. The actual project works with --port 0 but no longer works when I use ember s.

[pzuraq]

Can you try running:

killall node

?

You can also try fully restarting your computer, usually if something has locked the port that'll force it off

[locks]

I am closing this issue as it does not seem a bug in Ember itself.
Please refer to #help in our Discord server if you need further assistance!

[svparijs]

The issue is related to 1 single project. Not the ember project.

[rodrigoyoshida]

Just to mention that after a fresh install of Ubuntu, Node and Ember I am facing this issue, so it can be related to Ember itself.

[chancancode]

@rodrigoyoshida see ember-cli/ember-cli#8794