A issue with your internet connection or router hardware is indicated by the red light on your TP-Link router. A red light on the TP-Link router typically indicates a configuration problem or that the device is not getting a consistent internet signal from your modem. Restarting your modem and router, checking cable connections, or resetting the router settings can all help resolve the red light on your TP-Link router. If the red signal doesn't go away, try changing the firmware on your router o...  more