How to find what is using a port on Windows

On Windows, a “port in use” error usually means some process is listening on that TCP (or UDP) port.

With PortPilot

1. Install PortPilot and open Ports in the desktop app (or portpilot ports).
2. Find the port. Bind address matters: 127.0.0.1:3000 is not the same as 0.0.0.0:3000.
3. Open the port. You get process name, pid, executable, and a service when Windows maps one.

You can do the same from the cloud dashboard after pairing.

Without PortPilot

Administrators often use:

netstat -ano | findstr :3000

Then Task Manager or tasklist /FI "PID eq <pid>". PortPilot exists so you do not have to stitch those tools together every time.

Next

• Kill a process using a port
• Troubleshoot port conflicts
• Download PortPilot