Īutomatically allow built-in software to receive incoming connections In Firewall Options, to remove an app, select it in the list, then click the Remove button. In Firewall Options, to add an app or service, click the Add button, select the item in the list, then click Add. This setting prevents connections to all other sharing services. In Firewall Options, select to prevent incoming connections to nonessential services and apps.īasic internet services are a set of apps that allow your Mac to find services provided by other computers on the network. If the firewall is turned off, click Turn On Firewall to turn on firewall protection.Ĭlick the Firewall Options button to change firewall settings.