Firewall (UFW)

Allow SSH

ufw allow OpenSSH

Allow HTTP

ufw allow 80/tcp

Allow HTTPS

ufw allow 443/tcp

Allow Nginx Full

ufw allow 'Nginx Full'

Allow specific port

ufw allow 8000/tcp

Enable firewall

ufw enable

Enable firewall (force)

ufw --force enable

Disable firewall

ufw disable

Check firewall status

ufw status

Check firewall status (verbose)

ufw status verbose

Delete rule

ufw delete allow 8000/tcp

Reset firewall

ufw reset