Is your server secure? Bastille is a free tool that will perform an assessment and help to isolate areas that are commonly exploited and general basic security points Extremely easy to install, this is a great tool to both improve you security and learn more about these settings as well. It will generate an .html assessment of your system with descriptions of each area. As you run it in the shell, it uses a text interface that takes you step by step through locking down permissions and settings. See our knowledge base at http://kb.sagonet.com/Linux_Security to learn more about how this tool might help you. Play with this on a non-production server to get familiar with it and see if it is right for you.