If your computer is connected via ethernet to a wireless router and your iOS device is also connected to the wireless router, than it should work. Just make sure that your computer and your iOS device are on the same local network.
It just doesn’t work always if you have an ethernet connection and a wifi connection on a Windows computer.
Which Steinberg SKI Remote version do you have installed ? (Devices->Device Setup->Steinberg SKI Remote)
cheers
arne