Even if you’re enough of an expert to configure your firewall to block certain kinds of Internet connections, the tricky part is knowing what to allow, and what to block. You can configure the Mac firewall to block outgoing traffic, but you have to use commands in Terminal, edit the firewall’s settings files, or use a third-party tool such as Brian Hill’s Flying Buttress. Aimed at the increasing population of users whose computers are constantly online, the software could prove useful for providing an early warning that a malicious program is running on your Mac and attempting to connect to other systems. Whereas the firewall software that Apple provides only screens incoming traffic (attempts to access your computer from the outside), Little Snitch watches for outgoing traffic-connections from software running on your Mac to addresses elsewhere on the Internet. Little Snitch 1.2.2 is a valuable application that picks up where Mac OS X’s built-in firewall leaves off.
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