ポート確認

netstat -anp tcp | grep 3000

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

lsof -i tcp:3000

http://stackoverflow.com/questions/3855127/find-and-kill-process-locking-port-3000-on-mac

portsscan

System > Libray > CoreServices > Application > Network Utility.app

portscan タブ