Turn on the application firewall in OS X:

  1. Choose System Preferences from the Apple menu.

Apple Menu and System Preferences
  1. Click Security or Security & Privacy.

Security and Privacy Icon
  1. Click the Firewall tab.

Security and Privacy Window
  1. Unlock the pane by clicking the lock in the lower-left corner and enter the administrator username and password.

Lock Icon
  1. Click "Turn On Firewall" or "Start" to enable the firewall.
  2. Click Advanced to customize the firewall configuration.
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