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I have a shiny new MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) running Sierra (10.12.4). When connected to my Apple Thunderbolt Display via an Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter, the ethernet is not initially seen. If I delete "Display Ethernet" in network settings and reconnect the display, then it rediscovers the connection and starts working OK.

But, when I plug into another identical display (I have one at home, one in the office) I have to repeat the process. This is a real PITA as I move between home and office every day.

Any ideas? My previous Macbook Air connected seamlessly with the ethernet of either display.

  • Do you think that this is simply a one time connection issue - just that you have to select things after connecting or could it be a cable starting to go and the ethernet drops in the middle of the day long after you've connected? – bmike May 23 '17 at 10:53

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