I have a EAP211 wireless bridge with the master in my house and the client on the roof of my outbuilding with a cable running down into the building itself, which is connected via cable through the passive PoE device into a Netgear Nighthawk access point in the building.  When I did the initial installation, it all worked.  I could reach both ends of the EAP211 Bridge and the Nighthawk AP over the wireless bridge.  Then, I updated the firmware and the wired LAN doesn't apparently pass any bits.

If I plug the cable into a Gigabit switch, (a TP-Link TL-SG1008D) then the link light on the switch blinks every few seconds, but never comes up and stays up, which is what happens if I plug the cable into one of the switched ports on the Nighthawk.

Normally, I'd suspect cabling, but it did work at first and the PoE is providing power and I've tried several cables between the PoE injector and the wired LAN device inside the building.  Besides, I'd rather not climb back up on the roof without exhausting all other options first, so I'm hoping there's something else.