If the Ethernet connection is not working, try resetting the network interface:

• Disconnect the hub from your computer.
• Open your Network settings (System Settings > Network).
• Remove "USB 10/100/1000 LAN" by selecting it and clicking the minus (-) button.
• Plug the hub back into your computer.
• Add "USB 10/100/1000 LAN" back by clicking the plus (+) button.
• Open the Advanced settings for that connection and click "Renew DHCP Lease," then click OK.

Check the connection. "USB 10/100/1000 LAN" should now show as connected.

If it still will not connect, restart your Mac: shut down completely, wait 30 seconds, then power back on.