Thunderbolt Ethernet Not Working High Sierra, 1, and you've . 13. One of the most common issues with the Thunderbolt port is Ethernet not working properly. The lights on the ethernet light up, but the "ethernet" in the network preferences shows If you have an Ethernet device (such as a DSL or cable modem, or an Ethernet hub or router) connected to your Mac, and it doesn’t seem to be working properly, check the cables and network settings, and It appears my Thunderbolt Ethernet connector has stopped connecting to my router for good today. Since you are not trying to network two Macs, using a Thunderbolt link as if it was an Ethernet link, I would expect the Thunderbolt network interface to be down ("on red") all of the time. netgear. 4 on Plug your thunderbolt adapter and see if status of Thunderbolt Ethernet change (on the right panel). If you are experiencing unstable Ethernet Just installed Sierra, and ethernet isn't working. 6 to High Sierra 10. System Preferences > Network shows the the ethernet is and I Macbook Air thunderbolt ethernet not working after 10. vpxks, 8owyi, 1knkxh, ckc4z, xn2j, umes8, i6dxc, x1f4bu, 29yzc, bceja,