UFW Firewall Basics: Secure Your Linux Server

Secure your Linux server with the UFW firewall — simple and effective on Ubuntu/Debian.

Step 1: Enable UFW

Run ufw enable to activate the firewall. Default deny incoming, allow outgoing.

Step 2: Allow Required Ports

Allow SSH before enabling: ufw allow 22/tcp. Then allow web: ufw allow 80,443/tcp.

Step 3: Check Firewall Status

Run ufw status verbose to verify active rules.

ufw deny from 203.0.113.0/24
ufw reset  # caution: removes all rules

Terminal screenshots are original illustrations created for Gnome IT Solutions (blog.gnomeitsolutions.com).