Fail2Ban is an open-source, host-based intrusion prevention system (HIPS) that enhances server security by monitoring log files for failed authentication attempts and blocking malicious IPs. It helps protect against brute-force attacks on services like SSH, Apache, and more.

Features of Fail2Ban:

• Monitors system log files to detect multiple failed login attempts.
• Automatically bans suspicious IPs by updating firewall rules (iptables, firewalld, or ufw).
• Highly configurable with customizable ban rules, time limits, and whitelisting.
• Supports multiple services, including SSH, Apache, Nginx, and more.
• Can send email notifications about blocked IP addresses for security monitoring.

To check the installed version, run:

 fail2ban-client --version 

Disclaimer: Fail2Ban® is an open-source project under the GPL license. It is not affiliated with, endorsed by, or sponsored by any commercial entity. Fail2Ban is provided "as is," without any warranty, express or implied. Users are responsible for configuring and using Fail2Ban according to their security needs.