Now re-create a new network service that is associated to the Thunderbolt dock by clicking on the “+” button. Remove all the “Thunderbolt Ethernet Slot” including the unused ones and the one with green dot.ģ. To do that, highlight the Thunderbolt Ethernet Slot X from the list and click on the “-” (Delete the selected service) button on the bottom left, then click on “Apply” button. You can remove any unused and current “Thunderbolt Ethernet Slot X” that is associated to your new Thunderbolt dock. For example, if you switch from TS3 Plus to TS4, and TS4’s “ Thunderbolt Ethernet Slot X” shows green dot and can obtain IP address from DHCP server but not network traffic, you will need to remove it and re-create a new one in case macOS still uses the old TS3 Plus network setting. Notes: If you previously used other Thunderbolt docks, you may need to remove all the previous and un-used “ Thunderbolt Ethernet Slots” in macOS then create a new one for the new dock.

Please try the followings to recreate the new Thunderbolt Ethernet Slot in macOS and disable “ Energy Efficient Ethernet” (EEE) feature.

If the Ethernet port on the TS4 or TS3 Plus can not obtain IP address from DHCP server or does not have any network traffic even it is connected to your router / switch properly, this might be related to your previous network setting in macOS or “Energy Efficient Ethernet” compatibility. Notes: For macOS users, in order to have the most reliable Ethernet connection, please update to the latest macOS13, Ventura or above.

Mac ethernet adapters duplex issues