What IS a Firewall:

In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.  A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.

Via: Wikipedia.com

All Macs come with a Firewall, but the user has to manually enable it.

Here’s how:

  1. Go to the  Apple menu.
  2. Choose “System Settings”.
  3. Click on “Network” in the sidebar list.
  4. Click on “Firewall”.
  5. Toggle the switch for Firewall to the ON position.
  6. That’s it. 

 

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