Find (and kill) process locking port 3000 on Mac.

Question

How do I find processes that listens to/uses my tcp ports? I'm on mac os x. (update: 10.5 leopard)

I'm having trouble with RubyMine losing control of my rails app and getting detached from the process, locking port 3000. I can't find it using ps -ef... How do I find the stupid thing, kill it, brutally... ?

Address already in use - bind(2) (Errno::EADDRINUSE)

Answer 1

You can use lsof -i:3000.

That is "List Open Files". This gives you a list of the processes and which files and ports they use.

Updated thanks to Ole.

Answer 2

You can try netstat

netstat -anp|grep 3000

If your netstat don't support -p, use lsof

lsof -i tcp:3000