security

This guide will show you how to properly install APF firewall, one of the better known Linux firewalls available, on different Linux distros like Redhut/CentOS and Debian/Ubuntu. Configuration part doesn't differ from distro to another distro, so reading the official README file or googling will suffice.

If you allow SSH access to your server, there are some simple steps you can take to restrict access and protect yourself from brute force attacks. Two of my favorite scripts to do this are Advanced Policy Firewall coupled with Brute Force Detection, both by R-FX Networks.