Firewall

Are you a bit paranoid or security conscious? Perhaps you want to be able to track down when someone is trying to break into your Mac. OS X has a decent firewall, but tracking down what it's blocking can be a bit of a chore. Logging isn't on by default, so you have to do this manually.
Here is how to do it:

Open 'System Preferences'

next, choose 'Sharing'
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Enabling the firewall and stealth mode under OS X Tiger.

Enable the firewall and be sure to Click Advanced

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