Learn how to set up the Macintosh OS 10.2 – 10.5.x firewall to protect your computer against malicious activity.

This basic firewall closes off unused network service ports, but lets you create exceptions for specific services running on your computer. To check your version of OS X, open the

Because of this fact, the most of the Apple Mac OS X users does not have any of the antivirus installed, let alone any of the firewall, it will becomes the favourite target of the hacker. Mac Firewall is good for spyware stopping, stop Trojan from sending the information of the credit card and monitoring the key logger installed. If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos. Using Mac OS X’s Built-in Firewall A firewall watches all the network communications coming into your Mac — it automatically plays the role of security guard, blocking or denying certain network traffic that you want to avoid from reaching your Mac. It acts as another layer of security to help keep you safe from unwanted attacks.

Apple menu (the blue apple icon in the upper left corner of the screen), and select About This Mac.

1. Open System Preferences

• Open the Apple menu, and select System Preferences...
• Click the Sharing icon in the 'Internet & Network' area of the pane, or open the 'View' menu at the top of the screen, and select Sharing

2. Activate the firewall

• Click the Firewall tab
• Find the words 'Firewall On' or 'Firewall Off' on the left side of the pane, under the tabs
• If you see a 'Start' button underneath, click it to activate the firewall. If you see a Stop button, the firewall is already active
• If the Start button is gray and you can't click it, click the lock icon at the bottom of the pane, and enter your password when prompted
  

3. Create exceptions for certain programs or services

• Mac OS X automatically opens ports for all services checked on the Services tab. If you run services like Retrospect Backup or iTunes Music Sharing on your computer, open additional ports in your firewall to create exceptions and let these services through. If you do not need additional open ports, close the Sharing pane to save your changes
• To make additional changes, keep the Sharing pane under the Firewall tab open, and click the New... button

4. Finish and save your changes

• Select the service you wish to add from the Port Name: drop-down menu
• If you don't see the needed port name, select Other from the drop-down menu. Enter the port number in the Port Number, Range, or Series: field, and enter a description of the additional service in the Description: field
• Click OK to add the new exception to the firewall
• Close the Sharing pane to save your changes
  

Today is the 20th anniversary of the release of Mac OS X. I wrote a bit about it in my Macworld column this week, and also put together a little Mac OS X timeline.

I’ve written a lot about Mac OS X over the years. Compiling that timeline reminded me of that. I was a features editor at Macworld when Apple began shipping OS X precursors, and so I edited most of our early coverage. Beginning with Mac OS X 10.1, I wrote most of Macworld’s big feature stories covering each release.

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I’ve lived in the same house since 1999, so I have spent many springs and summers sitting out in my yard under our redwood tree writing and editing articles about Mac OS X, OS X, and now macOS.

How many? This many:

• OS X Prehistory (compiled by me from multiple Macworld features)

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Wow, that’s a lot of operating-system releases. Here’s to the next uncountable number of them.

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(While I wrote shorter reviews for Macworld, John Siracusa was always reviewing OS X at length for Ars Technica. Here’s a list of all his reviews.)

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