WiFi not auto joining

[Woofie2010]

Hello,
I never had an issue like this before, but for some reason it has started now.

For some reason my Mac will not auto join my local wifi network when I am at home.

When I go into system preferences I check the box that say auto join. I click apply, but then the box automatically uncheck itself.

Does anyone have any suggestion on how to fix this?

 

[Slartibart]

• Temporarily disable Wi-Fi on your Mac by clicking on the Control Center icon in the menu bar at the top-right corner of your screen.
• Next, open Finder and head over to an easily accessible location. Make a new folder here and use a suitable name. Once you’re done, click on “Go” from the menu bar and choose “Go to Folder” from the dropdown menu to proceed.
  
  
  
• This should bring up a tiny window on your screen where you’ll be able to enter the path. Copy/Paste the following path and click on “Go”.
  

  /Library/Preferences/SystemConfiguration/

• Next, find and select the following files in the SystemConfiguration folder.
  “NetworkInterfaces.plist”
  “com.apple.wifi.message-tracer.plist”
  “com.apple.airport.preferences.plist”
  “preferences.plist”
• Once all these files are selected, move them to the new folder you created. Now, restart your Mac and then re-enable Wi-Fi from the macOS Control Center.
• Connect to your home wlan.