How to Open a Port on a MacBook

Click 'System Preferences' from the Dock and select the 'Sharing' icon.
Check each box to enable sharing for the type of content you want to share. For example, check the 'File Sharing' box to enable File Sharing.
Select the 'All Users' radio button to allow access to anybody. Select 'Only These Users' to allow access to only the listed users. If you want to add users, click the '+' button, select a user or group from the Users & Groups list and click 'Select.'
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