Fail2ban is a simple tool to protect servers from bruteforce attacks, which automatically blocks IP addresses from which suspicious or unauthorised connection attempts are detected.
1. update system package list
sudo apt-get update
2. install fail2ban package
apt-get install -y fail2ban
Completed, the default configuration is configured to protect SSH, Apache login and FTP server. If you enter wrong login details 6 times, your IP address will be blocked for 10 minutes.