Fixing Wi-Fi issues on OSX

Trash Existing Wi-Fi Preferences in OS X to Start Fresh

1. Turn off Wi-Fi from the menu item in the upper right corner of OS X
2. Go to the Finder  and hit Command+Shift+G to bring up the Go To Folder command, choose the following path exactly:
/Library/Preferences/SystemConfiguration/
3. Delete all these files:
com.apple.airport.preferences.plist
com.apple.network.identification.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist



4. Reboot the Mac
5. Turn On Wi-Fi and connect.