Uncomplicated Firewall (UFW)

Enable Uncomplicated Firewall (UFW) and allow inbound SSH access by opening port 22 (default SSH port).

This guide is intended for Debian and Ubuntu-based systems.

Install:

sudo apt update && sudo apt install ufw -y

Allow:

sudo ufw allow ssh

Enable:

sudo ufw enable

Check Status:

sudo ufw status verbose

Enable Logging:

sudo ufw logging on

Enable	sudo ufw enable
Status	sudo ufw status verbose
Disable	sudo ufw disable
Allow	sudo ufw allow <port>/<optional: protocol> example: sudo ufw allow 22/tcp
Deny	sudo ufw deny <port>/<optional: protocol> example: sudo ufw deny 22/tcp
Delete rules by rule number	sudo ufw status numbered
Delete by number	sudo ufw delete 4