on the motherboard of the Axon HD Pro, there are 2 Ethernet ports, both ports are active.
it is suggested to use the port closest to the IEC power connector (left side, looking from behind)
the CMA application looks for available ports, and will use the first port it finds in software- this corresponds to the port closest to the power connector. this has been a source of confusion, and later models of HD Pro servers will have stickers placed over the second Ethernet port.
fyi.
the two brass colored ports are for wifi, and a not in use. please do not connect anything to these ports.