Sensor Gateway does not work on PoE

I tested multiple gateways on this ethernet cable, this is the only one which does not work. No power. It does power up on an adapter. I tried a Reset, no difference.

Your unit, may be defective .. If it is DOA then you can file for an RMA.. if it worked before then possible damage on the Ethernet port. https://serverscheck.com/support/rma.asp