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You’ll find your Mac’s firewall in the Security and Privacy preference in the System Preferences app.
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To start using the firewall, once you’ve entered your password, all you need to do is click the button that says Turn On Firewall
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Depending on what applications you have running and which sharing services you have turned on, what you’ll see when you look at Firewall Options may be a little different than what you see in the following screenshot:
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If you selected File Sharing in the Sharing preference you should now see File Sharing (AFP, SMB) in the list of allowed applications.
Fire up your Mac's firewall
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