Check Status and enable firewall

ufw status
ufw enable

ufw status verbose
ufw status numbered

Allow – Deny (Input, Output, Forward)

ufw default allow outgoing
ufw default allow incoming
ufw default deny outgoing
ufw default deny incoming

Management

Delete Numbered rules:

ufw delete 1

Disable IPv6 rules by changing:

pico /etc/default/ufw
sudo ufw disable
sudo ufc deny

App list – allow / deny apps

sudo ufw app list
sudo ufw allow OpenSSH
sudo ufw dany OpenSSH

Links:

• https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu