The Host Port on the TBT-UDM is the USB-C port next to the power button on the front, indicated by a laptop symbol and the “96W” labeling.

What Happens If I Connect to Other USB-C Ports?
Other USB-C ports on the dock will not work as a host port, and attempting to use these ports as a host port will result in little to no functionality.
Applicable To:
TBT-UDM