Some motherboards disable power to their ethernet port upon sleep and so WoL will not work. This is particularly common if the NIC is a power hungry 10GbE port

Some motherboards disable power to their ethernet port upon sleep and so WoL will not work. This is particularly common if the NIC is a power hungry 10GbE port. However, in the particular case I found, the motherboard also disables oower to any usb GigE adapter attached. The solution I found was to attach a USB hub with (empty) SD slots and integrated GigE port. As SD cards require power to remain mounted, the motherboard did not shutdown power to this adapter and WoL worked.