Firewall security in macOS

macOS includes a built-in firewall to protect the Mac from network access and denial-of-service attacks. It can be configured by going to System Settings > Privacy & Security (macOS 13 or later), the Security & Privacy pane of System Preferences (macOS 12 or earlier), or by using a configuration profile with the Firewall payload installed manually or provided by a device management service. The following configurations are supported:

  • Block all incoming connections, regardless of app.

  • Automatically allow built-in software to receive incoming connections.

  • Automatically allow downloaded and signed software to receive incoming connections.

  • Add or deny access based on user-specified apps.

  • Prevent the Mac from responding to ICMP (Internet Control Message Protocol) probing and portscan requests.

Published Date: February 18, 2021
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