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[Solved] Big Sur - Wifi no longer working? Here is how to fix it!

 
Apple/Mac Hardware
Last Post by Hans 3 years ago
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 Hans
(@hans)
Famed Member Admin
Joined: 11 years ago
Posts: 2728
Topic starter February 24, 2021 12:45 PM  

So I ran into an issue where my WiFi suddenly stopped work.
Like completely not even picking up available networks.
I've had this experience on a Mac Pro trashcan (2013) and I have found others to experience this on iMac's, Macbook, etc as well.

There is a manual fix for this, use at your own risk of course, but it worked for me on multiple Macs.

The steps to follow:

  1. Turn off WiFi in the menu bar.
  2. In case it's open: Make sure to close the System Preferences window.
  3. In Finder, go to /Library/Preferences/SystemConfiguration/  (in Finder, press ⌘ + Shift + G).
  4. Copy these files to your Desktop, or any safe location, in case you'd like to put them back if things go sideways on you:

    Note: one or the other file may be missing on your system, which should not be a problem. My Mac Pro specifically missed "com.apple.network.identification.plist".

    com.apple.airport.preferences.plist
com.apple.network.identification.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist
  5. Now delete these files from their original location - you will have to enter your password to get permission to do so.
  6. Reboot your Mac, and after reboot enable WiFi again ... and you should be good to go ...

   
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