Catch Mac OS X Net hackers red-handed

HenWen is a network security package for Mac OS X that makes it easy to configure and run Snort, a free Network Intrusion Detection System (NIDS). HenWen’s goal is to simplify setting up and maintaining software that will scan network traffic for undesirable traffic a firewall may not block. Everything you need to have is bundled in; there is no compiling or command line use necessary. HenWen is free for personal, non-profit, educational, and government use. It is $25 shareware for commercial use. It requires Mac OS X 10.2 or later, or OS X Server 10.2 or later, and a network connection. It should work just fine on Xserve servers. according to the developer, Nick Zitzmann. More info and download link here.