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If you are a Mac user, there might be chances that you may not even know that Mac OS X comes with a built-in firewall. This firewall helps ensuring that unauthorized app and services won't be able contact your computer, and prevents intruders from connecting to your Mac on a network. If your firewall is off and you are connected to a network, intruders or anonymous can connect to computer secretly. By default, Mac OS X's firewall is disabled or off. But if you are connected to the Internet through a router or modem, then it might not be that important but its still usefull to have it. Furthermore, Mac OS X's firewall won't prevent services or apps from connecting but can be use to block incoming connections. The firewall is very useful when running a test on a webserver and you don't want any one to connect to it. This article is just a simple tutorial on how to enable firewall on Mac OS X. Follow the below steps

1. Open the System Preferences.

2. Then click on “Security & Privacy”. 

3. Now click on the “Firewall” tab.

4. Note: Before you can make any changes, you need to enter your admin password. Now click on the lock icon in the lower-left corner and then enter you admin password.

5. Then tap on the "Turn on Firewall" button.

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