These two critical Mac security features are off by default - how to turn them on and why you should

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Close Home Tech Services & Software Operating Systems Mac OS These two critical Mac security features are off by default - how to turn them on and why you should You're leaving your Mac exposed if you haven't enabled these two security features. Written by Jack Wallen, Contributing WriterContributing Writer April 29, 2026 at 7:47 a.m. PT

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ZDNET key takeaways

• A Firewall should be considered a necessity.
• Macs typically ship with Firewall disabled.
• Macs also have Stealth Mode for even more security.

Because I've used Linux for so long, it was easy to take security for granted. But even with that more secure operating system, there are things I do to heighten protection.

When I started using MacOS for things like video editing, I did the same thing and assumed it was safe from would-be intruders. And then I eventually came to the conclusion that if a computer is connected to a network, it's vulnerable, regardless of the OS.

Also: 6 MacOS settings I immediately change on every new Mac - and why

Upon arriving at that conclusion, I realized I needed to get serious about security on MacOS. That led me to two things: Firewall and Stealth Mode.

What are Firewall and Stealth Mode on Mac?

Most have heard of (or even used) a Firewall, which is not the same as antivirus software. 

For those who have not, it's a very simple concept to understand. A Firewall monitors incoming and outgoing network traffic and either allows or denies it, based on a set of preconfigured rules. Generally speaking, those predefined rules are good enough for the average user (although some might need to add rules to allow traffic such as from SSH connections). 

In other words, when a Firewall is enabled, your system is much more secure than when it's disabled.

Also: MacBook Pro vs. MacBook Air: We tested both models, and here's which one to buy in 2026

Stealth Mode is related to Firewall in that it ensures that your Mac doesn't respond to either "ping" requests or connection attempts. Ping requests and connection attempts are often used by hackers to see what's what on a network, which can be a first step in an attempted break-in.

As you've probably assumed by now, it would behoove you to have both Firewall and Stealth Mode enabled. 

How to enable Firewall on your Mac

For whatever reason, most Macs ship with Firewall disabled. That has been the case with every MacBook and iMac I've owned. Here's how you enable it.

1. Open System Settings

The first thing to do is open System Settings, which can be done by clicking the Apple icon at the left edge of the Menu Bar (top bar).

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Also: How to decide between Linux and MacOS - if you're ready to ditch Windows

2. Open Network

From the System Settings app, click Network in the left sidebar.

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3. Navigate to Firewall

Firewall is located in the Network section, which is accessed from the left sidebar.

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4. Access Firewall

In the Network section, you'll see Firewall listed under the connection type you use (such as Wi-Fi). Although mine is listed as Active, yours probably says "Inactive." Click Firewall.

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5. Enable Firewall

Click the On/Off slider for Firewall until it's in the On position. Once you've done that, Firewall is enabled, and Options is available.

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How to enable Stealth Mode on your Mac

Once you have Firewall turned on, click Options, and you'll see "Enable stealth mode" at the bottom. Click the associated On/Off slider, and you're done.

Also: 9 essential Mac apps everyone should be using in 2026 - and why I vouch for them

Congrats, your Mac should now be a bit more secure.

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