DenyHosts and Fail2Ban

DenyHosts protects your SSH for brute-force login attempts.
Fail2Ban protects your for several services.

Installation guide for Fail2Ban
https://www.digitalocean.com/community/articles/how-to-protect-ssh-with-fail2ban-on-ubuntu-12-04

Installation guide for DenyHost
https://www.digitalocean.com/community/articles/how-to-install-denyhosts-on-ubuntu-12-04

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