Fail2Ban
Fail2Ban is free server security software that monitors log files and automatically bans IP addresses after repeated failed login attempts (e.g., SSH, Apache) to prevent brute-force attacks. Essential in hosting environments for intrusion protection, it integrates with firewalls like iptables.
Fail2Ban monitors server logs and blocks addresses that fail unusually often. This is one of the most effective and discreet security measures available because it stops attacks before they even reach WordPress.
Regarding its effect: A typical WordPress installation experiences between 50 and several hundred automated login attempts daily. A rule like "five failed attempts in ten minutes, then a one-hour ban" eliminates the vast majority of these. The computational effort required is negligible, whereas each blocked attempt would otherwise have burdened PHP and the database.
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