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I recently purchased a MacBook Pro with M3 chip running Sonoma 14.3.1 (to replace a MacBook Pro that used an Intel chip and ran Ventura 13.6.1.) I need to open Port 2001 to use socket.io for an app I am developing. On the older Mac, I simply entered : sudo ufw allow 8001 Now the Mac apparently uses pfctl as a firewall, but the documentation on how to open a port is not at all clear. Can you help.