El Capitan’s built-in software firewall acts as the wall surrounding your castle — er, your Mac — by allowing in the communications you want while preventing unknown communications from potential threats. The firewall works with your Internet connection and with any networks you may have joined.
To display the Firewall settings, click the System Preferences icon on the Dock and then click the Security & Privacy icon. Click the Firewall tab to display these settings.
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If your firewall hasn’t yet been turned on, click the Turn On Firewall button to start the ball rolling.
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Is the Turn On Firewall button disabled? Don’t panic; just click the padlock icon in the lower-left corner. If El Capitan prompts you for your Admin user account password, type it and then click Unlock.
Click the Firewall Options button, and El Capitan presents three options you can set:
You can manually add an application to the Allowed list. Click the button with the plus sign at the bottom of the list and then navigate to the application that needs to communicate with the outside world. Click the application to select it and then click Add. Remember: Only third-party applications you install yourself will likely need to be added to the Allowed list, because all the applications that Apple includes with your Mac are already on the list.
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To delete an application from the Allowed list and return it to blocked status, select it in the list and click the button with the minus sign.
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You can edit the settings in a specific application by clicking the pop-up menu on the right side of the entry. By default, the setting is Allow Incoming Connections (including both your local network and the Internet). However, you can choose Block Incoming Connections to prevent that application from receiving any communications.
If you suddenly can’t connect to other computers or share files that you originally could share, review the settings that you enabled on this pane: They may be the culprits. You can also verify that the correct sharing services are still enabled in the Sharing pane within System Preferences. (When you enable a service through the Sharing pane, El Capitan automatically adds that service to the Allowed list.
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When you turn on Printer Sharing on the Sharing pane, for example, El Capitan adds a Printer Sharing entry to the firewall’s Allowed list.) Open the System Preferences window and click the Sharing icon, and make sure that the services you want to provide are selected.
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December 2020
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