We've shown you how to enable the included firewall in OS X, but it's quite limited. It allows you to block traffic on a per-app basis, but beyond that there's not a lot of configuration options. Whether you want to know which programs are using your network or block certain applications from using it out altogether, Little Snitch is the Mac firewall you've been looking for. It's easy to use but also provides access to advanced features – such as system-wide rules and a handy network monitoring tool.
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