MAMP PRO Is Saying Another Process Is Running on the Port I Want to Use
If MAMP PRO cannot use the web server, database, or another port due to another process running on it, you may receive an error message indicating the port is already in use. MAMP PRO will automatically suggest an alternative port.
To confirm whether another process is using the port you want, open Terminal and run the following command (replace 80 with the port you want to check):
sudo lsof -i :80
This command will display any processes using the specified port.
For more details, refer to the MAMP PRO documentation on ports.