Similar but different: I have a 200m Ethernet run (PoE repeater midway), outdoors, FTP, going to a mast atop a hill.

There’s lightning protection etc. on the circuit.

It’s worked fine for several years.

Last week, we had a huge electrical storm - and every time lightning flashed within 8km, the switch at the cabin would reboot. Unplugged, stuck a scope on the Ethernet cable - and lo and behold, 30V+ flashes every time lightning struck anywhere even remotely nearby. The cable is acting like a great big antenna.