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Apple Sierra 10.12 Additional Fix for Wi-Fi issue

Source: http://osxdaily.com/2016/09/22/fix-wi-fi-problems-macos-sierra/

This is going to involve removing some system configuration files, therefore you should backup your Mac first, just in case. Do not remove any other system configuration files.

  1. Quit any active applications that are using wi-fi or the internet (Safari, Chrome, etc)
  2. Turn OFF wi-fi by selecting the wi-fi menu​ bar item and choosing “Turn Wi-Fi Off”
  3. Open Finder in macOS and pull down the “Go” menu and choose “Go To Folder” (or hit Command+Shift+G to get there quickly)
  4. Enter the following path exactly into “Go to folder” window and choose “Go”
  5. /Library/Preferences/SystemConfiguration/

  6. Locate and select the following files in the SystemConfiguration folder
  7. com.apple.airport.preferences.plist
    com.apple.network.eapolclient.configuration.plist
    com.apple.wifi.message-tracer.plist
    NetworkInterfaces.plist
    preferences.plist

    fix macOS sierra wifi problems by trashing wireless preferences

  8. Remove those matching files, you can either place them into a folder on the desktop as a rudimentary backup, place them into the Trash without emptying, or actually delete them
  9. After those matching wi-fi configuration files are out of the SystemConfiguration folder, reboot the Mac by going to the  Apple menu and choosing “Restart”
  10. When the Mac has booted back up as usual, go back to the Wi-Fi menu and choose “Turn Wi-Fi On” and join your typical wireless network

 
 Last modified at 12/7/2016 5:43 PM by Tran, Kiem