Learn about it:
Who's There? Firewall Advisor
View, understand and react to access attempts detected by your firewall
Provides advice and helps you take action to combat access attempts
Includes specific support for Leopard and Snow Leopard networking services
Enhances our DoorStop X Firewall and others
Available standalone or as part of our integrated Security Suite
Who's There? is designed to work best with our DoorStop X Firewall, book "Internet Security for Your Macintosh and iPhone," and blog, isfym.com, as part of the DoorStop X Security Suite.
Open Door Networks has been securing the Mac since 1998 and Mac OS 8. We literally wrote the book on Internet security.