2
How to Setup a Firewall to Secure Your Linux Server
Setting up a firewall is the second thing you should do immediately following the setup of your linux server (the first should be to Secure SSH Login). Learn how to do both.
11
How to Secure SSH Login on Your Linux Server
Generally it is not secure to allow remote root login. Additionally, using Password Authentication is also insecure. So… after setting up my server at RackSpace, the next step was to setup basic SSH login security.