System Firewall
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It is good security practice to enable the firewall on a new Mac (or any computer), which makes it more secure against attacks, especially if you haven't yet installed the latest security updates. To enable it follow the following steps:
1. Open System Preferences, which can be found in the Apple menu.
2. Choose the Sharing preference pane (it's in the Internet and Network section).
3. Select the Firewall pane and click the Start button to turn on the firewall.
4. You can also enable Stealth Mode for even greater security. To do this, click on the Advanced button, shown above, then check the 'Enable Stealth Mode' box.
Note: Some applications, such as multiplayer games, may require that you temporarily disable the firewall.
