Have you tried simply turning the Rio Receiver off and back on again ?

It normally takes 2 or 3 attempts to get my Receivers to talk to whatever hub/switch they are plugged into. If when you first turn them on you don't get a link light showing a working Ethernet connection then you need to turn it off and back on again.

They almost never get a link on the first attempt for me.

Apologies if you have already tried this.