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Mac OS X includes an easy-to-use firewall thatcan prevent potentially harmful incoming connections from othercomputers. To turn it on or off:

Hop-pie-pop Mac Os X

HoP-PiE-PoP Mac OS

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Hop-pie-pop

Mac OS X 10.6 and later

Mac Os Mojave

  1. From the Apple menu, select System Preferences....When the System Preferences window appears, from theView menu, select Security & Privacy (10.7 and later) orSecurity (10.6).
  2. Click the Firewall tab.
  3. If the orange padlock icon in the lower left side of the window isclosed, click it, and then authenticate with your Mac's administratorusername and password. This will allow you to make changes.
  4. Click Turn On Firewall (10.7 and later) or Start(10.6) to enable the firewall. Click Turn Off Firewall (10.7and later) or Stop (10.6) to disable the firewall.
  5. To configure the firewall, click Firewall Options...(10.7 and later) or Advanced... (10.6). In the sheetthat appears, choose from the following options:
    • For the strictest setting, check Block all incomingconnections.
    • Check Automatically allow signed software to receive incomingconnections to allow digitally signed applications access to yournetwork without prompting.
    • Click Enable stealth mode to have your computer ignorepings and similar software that attempts to discover your computer.
    • Use the plus and minus buttons to add and remove applications fromthe firewall. When added, you can either allow or block traffic tothem.

    Click OK to save your settings.

Mac OS X 10.5

Hop-pie-pop Mac Os 11

  1. From the Apple menu, select System Preferences....When the System Preferences window appears, from theView menu, select Security.
  2. Click the Firewall tab.
  3. If the orange padlock icon in the lower left side of the window isclosed, click it, and then authenticate with your Mac's administratorusername and password. This will allow you to make changes.
  4. To configure the firewall, at the top of the window, click one ofthe radio buttons:
    • Set access for specific services and applications is thebest choice for most users; it will block most incoming connections,but allow you to make exceptions for trusted services andapplications.
    • Allow only essential services activates the firewall inits strictest mode.
    • Allow all incoming connections deactivates the firewall.