How to Configure the macOS Application Firewall

Step by step

1. 30 sec

   Open System Settings

   Click the Apple menu in the top-left corner of your screen. Select System Settings from the dropdown menu to open the central configuration interface.

2. 30 sec

   Access Network Settings

   Scroll down the left-hand sidebar of the System Settings window. Click on Network to reveal the network configuration pane, then click on Firewall.

3. 30 sec

   Enable the Firewall

   Toggle the switch next to Firewall to the On position. If prompted, enter your administrator password to authorize the change to your system security settings.

   Note: A green indicator confirms the firewall is active.
4. 1 min

   Configure Firewall Options

   Click the Options button located next to the Firewall toggle. This opens a modal window containing advanced parameters for incoming connection handling.

5. 1 min

   Set Connection Rules

   Enable 'Block all incoming connections' if you require maximum security and do not use file sharing or remote login services. Alternatively, leave this disabled to allow essential services while maintaining per-application control.

   Note: Blocking all incoming connections may interfere with printing or screen sharing.
6. 1 min

   Define App Exceptions

   Use the plus (+) and minus (-) buttons in the Options menu to add or remove specific applications. Set each application to either 'Allow incoming connections' or 'Block incoming connections' based on your security requirements.

   Note: Only add applications from known, trusted developers.