If you have a server with ssh conection maybe you havent a secure configuration, with this Howto we will have a ssh more secure.

1. With Root open /etc/ssh/sshd_config
2. Change to the next … Protocol 2 and PermitRootLogin no
3. Also you can change ssh’s port for example port 1230: Port 1230
   

You must to open the port 1230 in you Firewall and create a new user for “su”