http://smashingweb.info/wp-content/uploads/2014/05/openssh-security.jpg Changing the SSH port from the default running Port (ie Port 22) will strengthen the security and prevent lot of direct shell attacs to a server or virtual host running on Linux (Cent OS 6, Ubuntu 14.04, Ubuntu 12.04 or a Fedora 20 / 19). It adds another layer of security to the server and... Change SSH Port from Default - Cent OS 6, Ubuntu 14.04, Fedora 20