A number of suspicious access to Linux servers happens on the Internet every day. Fail2ban is software to protect Linux servers from brute-force attacks.
Installation on Ubuntu Linux server:
$ sudo apt update $ sudo apt install fail2ban
Configuration of Fail2ban:
Configuration files are located in directory /etc/fail2ban.
An example checks the status & unban an IP address for SSH service.
$ fail2ban-client status $ fail2ban-client status sshd $ fail2ban-client set sshd unban <IP Address>