UFW Firewall Rules

Common allow rules (adjust to your needs):

sudo ufw allow 22/tcp
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp
sudo ufw allow out 465/tcp

If using IPv6, ensure UFW is configured for IPv6 in /etc/default/ufw.

Enable and check status:

sudo ufw enable
sudo ufw status verbose

Be careful not to lock yourself out of SSH on remote servers.