I don't like Macs because they are hard to configure and many useful programs don't run under MacOS (however some useful tools such as Net Bus, Back Orifice, SubSeven support MacOS ).

Port scanner? - Of course, Nmap ( www.insecure.org/nmap/ ). It is one of the best port scanners for UNIX-like operation systems.
Norton Personal Firewall supports MacOS, it is a good firewall (at least for Windows ). You can find more information at:
http://www.tlsecurity.net/macintosh/...t/vulnscanner/
www.securemac.com

AIDeveloper.