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ufw

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ufw status
ufw enable
 
sudo ufw allow 22/tcp
sudo ufw allow 4500/udp
ufw start
 
sudo ufw deny 41194/udp
 
ufw app list
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Links
https://linuxconfig.org/how-to-delete-ufw-firewall-rules-on-ubuntu-18-04-bionic-beaver-linux

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