Liangxu Linux

Jun 24, 2025 · Information Security

How to Harden SSH Against Brute‑Force Attacks: Password Policies, Port Hiding, Non‑Root Users, and Fail2Ban

This guide explains four practical ways to protect a Linux server from SSH brute‑force attacks—using strong passwords, changing the default port, disabling direct root login in favor of privileged users, and configuring key‑based authentication—plus detailed steps to install and tune Fail2Ban with iptables for automatic IP blocking.