macOS Sierra: Enabling Your Mac's Firewall and Stealth
macOS Sierra’s firewall feature blocks unwanted network traffic coming into your computer, and Stealth Mode makes your Mac essentially invisible to hackers snooping for computers to target. Amazon.com: Apple MacBook Pro 15in Laptop Intel Quad Core Apple MacBook Pro 15in Laptop Intel Quad Core i7 2.3GHz (ME294LL/A) Retina Display, 16GB Memory, 512GB Solid State Drive, (Renewed) 3.5 out of 5 stars 17. $749.99. Apple MacBook Pro ME293LL/A 15.4-Inch Laptop with Retina Display (OLD VERSION) (Renewed) 4.4 out of 5 stars 33. $699.99 How to Turn On and Off Firewall on Your Mac - YouTube
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How to turn Firewall On / Off on a Mac - YouTube
Jul 10, 2017 Use Your MacBook's Built-in Firewall - dummies