Does your Linux box's security have holes in it?

Does your Linux box's security have holes in it?

Here's a good article describing how to check.

On a personal note I would always confirm these results by running an nmap scan of your system from another computer on the same network.

See http://www.cyberciti.biz/networking/nmap-command-examples-tutorials/
http://www.tecmint.com/find-open-ports-in-linux/