Restart your Mac: Choose Apple menu > Restart. My Macbook Pro has 4 ThunderBolt-3 Ports. The USB-C to Ethernet adapter is still not working. Updating the dock drivers helps, but I admit we have been swapping these docks out for usb-c variants (wd-15 I think). No caveats or phone calls. If it still doesn't appear, then you have hardware issues and I can't help you. On the specifications in the adapter case there is no mention of thunderbolt. Now you should be able to select 'Thunderbolt Ethernet' (these are the exact words you need to see - not bridge or 1 or 2 or anything. Just no display video signal. Select it. Support for thunderbolt monitors is still up in the air, and this technique may or may not work. In many cases, you’ll automatically connect to the internet. However, the ports work when the dock is connected to the laptop with a display port USB-C cable. But as I said the USB-c versions just work. Reopen apps: Quit and reopen any apps that use the device. Note: On iMac computers, the Thunderbolt logo on the Thunderbolt cable should face left (when looking at the back of the iMac). Interestingly, audio on displays still work and peripherals plugged into displays (as well as Ethernet) do work. If your computer doesn’t have an Ethernet port, try using a USB to Ethernet adapter, or a Thunderbolt to Gigabit Ethernet adapter. They just work. If the device appears but does not work, review the device’s documentation for further troubleshooting steps. I have seen issues with the thunderbolt ports working or not. In the window that appears, see if the Thunderbolt device is listed below Hardware in the list on the left. Is it because the adapter is compatible with only Thunderbolt-2 ports? Use an Ethernet cable to connect your computer’s Ethernet port to a modem or other network device (for example, a switch or a router). Bandwidth Issues With Thunderbolt 3. It must say 'Thunderbolt Ethernet'). I had many issues before with the system after a BIOS update (slow performance, usb poorts that would't work, windows that would not download updates, ect.). I read many postst with similar problems. The Thunderbolt logo must be face up on the Thunderbolt cable when plugged into both the UAD-2 device and the computer - if the Thunderbolt logo is not face up then the cable is inserted incorrectly. In some cases, TB3 eGPU setups may initialize at 20Gbps bandwidth for seemingly no clear reason. I have a Latitude 7490 with Thunderbolt 3 option and a TB16 dock. If its not there, try a different thunderbolt port or wait a few seconds. My issue is that the USB ports and Ethernet port on the TB16 dock does not work when the dock is connected to the laptop via a Thunderbolt 3 USB-C cable. Finally I had to reinstall the Mac OS Mojave to get the system working. It would not go the desktop. In such a case, the cable is most likely at fault. 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