Networking two Mac computers directly with a Thunderbolt 3 cable requires Thunderbolt-enabled hosts
Mac computers support networking between two Thunderbolt hosts using the appropriate Thunderbolt cable.
If you're having issues with Thunderbolt 3 networking or were directed to this page when you connected a Mac to another host, check the following:
Make sure that your computers support Thunderbolt 3 over USB-C. If you're not sure, check with the manufacturer.
Connect your Mac directly to the other computer, not through a USB-C hub. USB-C hubs don't support Thunderbolt 3 connections between their ports.
Use a cable that supports Thunderbolt 3. Not all USB-C cables support the requirements of Thunderbolt 3. For example, the Apple Thunderbolt 3 (USB-C) Cable supports a Thunderbolt 3 connection, but a USB-C charge cable does not.
If you're connecting a Mac with Thunderbolt 3 to a Mac with Thunderbolt 2, use an Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 adapter and a Thunderbolt 2 cable.
If you need more help, contact Apple support or schedule a Genius Bar appointment.
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