Your Mac automatically reconnects to Wi-Fi networks you’ve previously connected to. Starting with macOS High Sierra, you can now tell your Mac not to automatically connect to certain Wi-FI networks. Your Mac will remember the Wi-Fi network’s passphrase and other connection details, but won’t connect unless you tell it to.

RELATED: How to Manually Add or Remove Wi-Fi Networks from OS X

This is useful for Wi-Fi networks you may use occasionally, like Comcast’s xfinitywifi or other public Wi-Fi networks. On older versions of macOS, you had to delete a saved Wi-Fi network and its passphrase to stop the automatic connection from occurring.

First, open the System Preferences window by clicking Apple menu > System Preferences.

Click the “Network” icon in the System Preferences window.

Select the “Wi-Fi” option in the left pane and choose the Wi-Fi network you want to modify from the Network Name box.

Uncheck “Automatically join this network” and your Mac won’t automatically join the Wi-Fi network in the future.

RELATED: How to Change Which Wi-Fi Networks Your Mac Connects to First

You can also set the order of your Wi-Fi networks to tell your Mac to prefer certain Wi-Fi networks over other ones. Your Mac will try to connect to available Wi-Fi networks in the order you choose, preferring the ones at the top of the list.

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Chris Hoffman is Editor-in-Chief of How-To Geek. He's written about technology for over a decade and was a PCWorld columnist for two years. Chris has written for The New York Times and Reader's Digest, been interviewed as a technology expert on TV stations like Miami's NBC 6, and had his work covered by news outlets like the BBC. Since 2011, Chris has written over 2,000 articles that have been read more than one billion times---and that's just here at How-To Geek.
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