UFW firewall management

ufw (Uncomplicated Firewall) simplifies the process of setting up firewalls on your server, without directly using iptables.

sudo apt install ufw

First we deny all incoming requests as the default:

ufw default deny incoming

And allow all outgoing requests as the default:

ufw default allow outgoing

Next we need to allow certain requests based on their port:

sudo ufw allow 22/tcp
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp

Enable:

ufw enable

Verify rules:

ufw status --verbose