I don't know if this applies to your situation, but I migrated from my old Mac Pro to my present iMac using a Thunderbolt to Firewire adapter For some reason, I couldn't get ethernet to work (and the same happened a few years ago when I tried it with a friend's computers).


Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365