Customize the firewall rule for an application

A firewall is a security system that uses rules to block or allow connections and data transmission between your Mac and the Internet. Firewall rules controls and protects your Mac from malicious programs and unauthorized access. The firewall automatically checks all traffic that comes in or out of your Mac against these rules.

You can use the Application Blocking window to customize the firewall rule for an application. You can use the up arrow and the down arrow next to the name of the application to allow or block Internet access for the application.

Customize the firewall rule for an application

  1. In the Application Blocking window, select the application name row.

  2. Click the up arrow or the down arrow next to the name of the application and do one of the following:

    • To allow the application to access Internet, choose allow.

    • To blow the application to access Internet, choose block.

  3. Click Done.

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DOCID: v56198041_nsmac_retail_en_us
Operating System: Mac OS X
Last modified: 09/01/2017