Ubuntu Firewall Configuration

Setup UFW Firewall

sudo apt install -y ufw
sudo ufw enable
sudo reboot now

Maintain Firewall rules

List Available Applications

sudo ufw app list

See firewall status

sudo ufw status

sudo ufw status numbered

Allow port connection

sudo ufw allow 22/tcp

sudo ufw allow "OpenSSH"

Allow connection from selected IP address

sudo ufw allow from 0.0.0.0 to any port 22

Deny port connection

sudo ufw deny 22/tcp

sudo ufw deny "OpenSSH"

Delete firewall rules

See firewall status

sudo ufw status numbered

sudo ufw delete 1

sudo ufw delete allow 22/tcp

Disable Firewall

sudo ufw disable