fail2ban: how to block brute force attacks on Linux step by step

Tue, 22 Sep 2026 09:00:00 -0300

Open /var/log/auth.log on any SSH server exposed to the internet and you'll see hundreds — sometimes thousands — of login attempts a day. Bots scan the entire IPv4 space within hours, testing username and password combinations against every port 22 they find. fail2ban is the standard answer to this: it watches the logs in real time and automatically bans any IP that exceeds the attempt threshold you set. Simple, lightweight and effective.

Fail2ban on Locodigital

fail2ban: how to block brute force attacks on Linux step by step