What's using port 3000 on my Mac? (and how to free it)
Usually an old dev server you forgot. OneMacTools' Dev & Agents shows every dev server by project with its ports, and answers “what's on port 3000?” with the program, folder and who started it, plus a Stop button.
With OneMacTools
- Open OneMacTools › Dev & Agents › Dev Servers.
- Type the port in “What's on port…”.
- Check the command and project folder, then click Stop… (it asks first).
With Terminal
Run lsof -nP -iTCP:3000 -sTCP:LISTEN to see the process id, then kill <pid>. OneMacTools does the same, and also shows the project and what started it.
Stop it happening
The runaway-process watchdog notifies you when a dev server has sat idle for a day, and can stop it after the time you set.
Do it with OneMacTools
Questions
What's on ports 5000 and 7000 on a Mac?
AirPlay Receiver (Control Center). Turn it off in System Settings › General › AirDrop & Handoff if you need those ports.
Is it safe to kill a process using a port?
If it's your own dev server, yes; it just stops. Don't stop system processes; OneMacTools only offers Stop for your own processes.
