Port 9229 in use

When trying to run wrangler dev I get

Error: listen EADDRINUSE: address already in use :::9229

It seems this is used for dev tools as per: https://github.com/cloudflare/wrangler2/blob/6937fe9bd07b23c3f8c481e0a11128615356ef64/packages/wrangler/src/dev.tsx#L644

It appears this is not properly closing or it’s being hung somewhere. I cannot see the port in something like netstat or lsof. Trying to kill all node processes yielded no success either (no process found).

@AlbertSPedersen is also able to reproduce this (both of us using Linux - he runs Arch by the way)

[threepointone]

Thanks for the catch, I heard a couple of other people also bump into this. For one, maybe we should use a different port altogether, since 9229 is used by other tools as well, and we own the whole thing. But we shouldn’t leave any hanging processes. I’ll investigate, thank you for the report!

[jgentes]

I run into this every time I try to use local mode on WSL2.

I think the issue is when we launch local mode it spawns node with the --inspect flag.

This will try to use port 9229 but that’s already in use. You can see it with lsof -i:9229 after launching wrangler dev.