Finally I had to reinstall the Mac OS Mojave to get the system working. Reopen apps: Quit and reopen any apps that use the device. However, the ports work when the dock is connected to the laptop with a display port USB-C cable. Same problem on two thunderbolt displays running on 2018 MBP. If your computer doesn’t have an Ethernet port, try using a USB to Ethernet adapter, or a Thunderbolt to Gigabit Ethernet adapter. Apple's Thunderbolt Display, for myriad reasons, may not display an image from your Mac, recognize USB peripherals, connect to Ethernet, or power on whatsoever. 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. It must say 'Thunderbolt Ethernet'). On the specifications in the adapter case there is no mention of thunderbolt. But as I said the USB-c versions just work. The USB-C to Ethernet adapter is still not working. I have ethernet issues with my Thunderbolt 3 dock 150W and my Zbook 15G3, running on windows 7 / 64 bit. In some cases, TB3 eGPU setups may initialize at 20Gbps bandwidth for seemingly no clear reason. They just work. Interestingly, audio on displays still work and peripherals plugged into displays (as well as Ethernet) do work. Bandwidth Issues With Thunderbolt 3. Is it because the adapter is compatible with only Thunderbolt-2 ports? My Macbook Pro has 4 ThunderBolt-3 Ports. Updating the dock drivers helps, but I admit we have been swapping these docks out for usb-c variants (wd-15 I think). In many cases, you’ll automatically connect to the internet. If it still doesn't appear, then you have hardware issues and I can't help you. I have a Latitude 7490 with Thunderbolt 3 option and a TB16 dock. 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. 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.). Note: On iMac computers, the Thunderbolt logo on the Thunderbolt cable should face left (when looking at the back of the iMac). Just no display video signal. In such a case, the cable is most likely at fault. 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. If its not there, try a different thunderbolt port or wait a few seconds. 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. 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). If the number reads 3.28.1, you’ll need to update the configuration to get the Ethernet port working properly. 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