On your primary Mac, open Network Preferences by going to System Preferences > Network, or by clicking on the Wi-Fi symbol in your menu bar and selecting 'Open Network Preferences'. Make sure you are using a Thunderbolt cable, as regular USB-C to USB-C cables (like the Mac's charging cable) will not work. Troubleshooting the Thunderbolt ConnectionĪ Thunderbolt bridge needs to be established between your Macs before Luna can connect using a Thunderbolt connection. Here is Apple's support article for troubleshooting an Ethernet connection on a Mac. create or switch to a new network location on your Mac.

restart your Macs, or restart your router or modem.

make sure both ends of the Ethernet cable are fully connected to each Mac, or router or access point.

If your devices are connected via Ethernet, the Status will change to Connected and the left side menu panel will either say 'Connected' or 'Self-Assigned IP' under the USB/LAN option. On your primary Mac, open Network Preferences by going to System Preferences > Network, or by clicking on the Wi-Fi symbol in your Mac's top menu bar and selecting 'Open Network Preferences'. In the Mac-to-Mac tab, change 'Allow any network interface' to your preferred connection method: Connect via Wi-Fi only, Connect via Ethernet only, or Connect via Thunderbolt only. In your Mac's top menu bar, click on Luna Display then Preferences. You can also adjust Luna's settings so that Luna will only connect over an Ethernet or a Thunderbolt connection, instead of Wi-Fi. Luna should connect automatically if it detects an active Ethernet or Thunderbolt connection between your Macs. Why is my Ethernet or Thunderbolt connection not working? Mac-to-Mac Mode: Connect via Ethernet or Thunderbolt Only

Usb to ethernet mac not working