MacWorld: Mac Security: Firewalls

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Do you need more than the firewalls built into OS X?

Oct 6, 2008
by Chris Pepper and Rich Mogull

Firewalls monitor and regulate the data moving on and off your computer or network. They can keep criminals out while allowing legitimate network traffic in. Mac OS X comes with not one but two firewalls of its own. However, those two aren't always enough.

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