Rich MogullContributor, Macworld

Rich Mogull is a security analyst at Securosis. He's the security editor at TidBits and has been covering security for 20 years.

Close the ports

While OS X has long included basic firewall software, Leopard introduced some significant changes to it, leaving many Leopard users confused as to how to keep their Macs secure. But though the firewall interface in Mac OS X 10.5 is indeed quite different from that in earlier versions of the OS, it’s still relatively easy to use.

Understanding and using Leopard's firewall

OS X has long included a basic firewall, but Leopard takes this fundamental security technology in a new and innovative direction. Rich Mogull looks at Leopard's firewall, how the 10.5.1 update changed things, and configuration options.