Ufw - mac firewall

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sudo ufw status verbose

sudo ufw allow from 127.0.0.1 to 127.0.0.1 port 3306 proto tcp

sudo ufw allow to any port 3306 proto tcp

ubuntu firewall config

From: https://askubuntu.com/questions/1259860/on-ubuntu-20-04-how-do-you-open-a-port-in-the-firewall 

 sudo ufw enable
 sudo ufw allow 4200
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