I was setting up a D-Link M15 to the TP-Link and could not get the internet to connect to the new WIFI name. Called up D-Link support which was free :) and they took me through the below steps to complete adn send me a email with the steps we took and it worked a treat. Fantastic service and again yes free :) Troubleshooting: - Physical connection (Internet>LAN4:Modem) - He has tried to set up the app - Manual Setup - Go to Settings > Internet: DHCP > Save - VLAN is off - Check the light (Flashing Orange) - Connect to the wifi (Phone) - Turn off the mobile data - Open a browser (192.168.0.1) - Go to Settings > Internet > Dynamic IP - Go to VLAN > Disable Triple Play > Save - Check the light (White) - Able to access the internet - Advised how to setup the extender unit   ... View more