Howtoforge published a tutorial about installing and configuring Fail2ban on Ubuntu 22.04.
How to Install and Configure Fail2ban on Ubuntu 22.04
Fail2ban works by scanning log files of services (e.f /var/log/auth.log) and banning IP addresses that show malicious login attempts such as too many incorrect passwords, seeking exploits, etc. Fail2ban also supports multiple firewall backend such as iptables, ufw, and firewalld. Also allows you to set up an email notification for every blocked login attempt.
In this tutorial, we will show you how to install and configure Fail2ban for securing the Ubuntu 22.04 server. This guide also covers the basic command of fail2ban-client for managing Fail2ban service and jails.
