A.

1) Disconnect your Multi-Port Adapter from your computer 

2) Open up your Network Preferences

3) Manually remove "USB 10/100/1000 LAN" from your Network by clicking the "-" symbol

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4) Plug your Multi-Port Adapter back into your computer

5) Manually add in "USB 10/100/1000 LAN" to your Network Preferences by clicking the "+" symbol

6) After adding your Ethernet back in, please click on "Advanced" tab

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7) In the "Advanced" tab, click on "Renew DHCP Lease" button

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8. Click "OK" and check your Ethernet connection. "USB 10/100/1000 LAN" should be connected now.