Vigilant system administrators will notice many failed login attempts on their internet connected servers. While its good to know that you are preventing these logins, they are filling your logs and potentially making it harder to see other problems. Additionally, these failed logins are taking up bandwidth and likely trying over and over again to get into your system. Fortunately, there is a solution to preventing these attacks from continuing on a Linux based system. The following tutorial will set up Fail2ban on a RedHat based system. We will monitor failed SSH logins and failed Webmin logins. Additionally, we will set up a unique jail that will block persistant attackers for a longer period of time.

Read the rest of this entry »

Tags: , , , , ,