Wifi issue on my Nexus 4
As you have mentioned problem seems to be coming after updation to android version to 4.4.2 you may want to refer to android-4-3-no-internet-access-unable-to-connect-to-the-proxy-server-error.

The reason seems to be If you have cleared your Google Service Framework data to recieve the update, it will change your device ID that google uses to recognise your device.