You can connect it to the USB port, for example if it is a wireless keyboard and you need to charge it, but you cannot control the router with it. The router doesn't function like a computer in that sense. First, there wouldn't be any visual output, as the router doesn't have a port for connecting a monitor. Also, WebUI uses HTTP and so any input on the keyboard would not be send to this service, as it requires a computer to get and send HTTP commands. Basically, USB RUT955 port is used for connecting printers, USB memory sticks and for charging devices, like your phone.