To ensure that random individuals don’t gain unauthorized access to your Mac, you should enable your Mac’s built-in firewall. Hackers love to run automated applications that can scan thousands of computers (including your Mac) for open ports that can be exploited. ![]() Once your Mac has reassembled the packets, you’ll see something, like an email message or web page.Ī firewall can help prevent bad packets from entering your Mac. Servers receive the packets, and then send other packets back to your Mac. But what is a firewall, and why do you need to use it on your Mac? Firewall Crash CourseĮvery time you request information from the Internet, such as a web page or email message, your Mac sends data packets to request the information. ![]() ![]() AirPort Apple Apps Backups Developer Education Email Hardware Internet iPad iPhone Mac Music Network Photos Security TV Weekend WonkĮvery Mac ships with a built-in firewall - a service that can be configured to disallow information from entering your Mac.
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