Ubuntu Server: SSH Hardening - Disable Root Login And Change Port.

• The easiest way to secure SSH is to disable root login and change the SSH port to something different than the standard port 22. 
• Before disabling the root login create a new SSH user and make sure the user belongs to the admin group (see step 4. below regarding the admin group).
• If you change the SSH port also open the new port you have chosen on the firewall and close port 22.
• Open a Terminal Window and enter :

sudo vi /etc/ssh/sshd_config

• Change or add the following and save.

Port <ENTER YOUR PORT>
Protocol 2
PermitRootLogin no
DebianBanner no

• Restart SSH server, open a Terminal Window and enter :

sudo /etc/init.d/ssh restart