Firewall – Netfilter:

sudo ufw status
sudo ufw enable
sudo ufw disable

sudo ufw allow 22
sudo ufw deny 22
sudo ufw delete allow 22
sudo ufw delete deny 22

>> To allow access from specific hosts:
sudo ufw allow proto tcp from to any port 22
>> To view which applications have installed a profile:
sudo ufw app list
>> To view details about which ports, protocols, etc are defined:
sudo ufw app info Samba

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