Port 4200 is already in use

1

Good afternoon

I am having a problem that has just started on any new ember apps created this morning. When I run ember serve I get Port 4200 is already in use, this also happens if I use a different port e.g. 8080.

This happens on my Macbook, a Centos VPS and a Ubuntu VPS. Am I missing a dependency or something else

Many Thanks

2

Hi,

A few of us ran into the same problem; in fact, I asked this same question on the Discord > Help channel.

You should be able to find a fix here, thanks to people who are way smarter than I am:

Good luck!

1 Like
4

Thank you for you help, back up and running now

5

Same here, after a Ubuntu, Node and Ember fresh install, can’t run a new ember project normally. I can run using the --port 0 parameter but it gives me a very high port.

They still did not release a new version so maybe they are not aware of this issue.

6

Any resolution found for this?

7

Add this to your package.json until it’s fixed on their side:

"resolutions": {
  "ember-cli/portfinder": "1.0.21"
}
1 Like
8

Portfinder 1.0.23 has been released, which rolls back to 1.0.21. This should fix the issue. If you still have the problem, you might have locked to portfinder@1.0.22. Upgrade ember-cli to get the latest portfinder version in that case.

1 Like