The ethernet port on the thunderbolt display is not working

The ethernet is working when the cable is connected directly to my mac laptop but when connected the thunderbolt display there is no connection.  Is there some type of set up for the ethernet connection or can this port just be broken? 
Thanks for the help! 

Afterthought on an older post: it isn't immediately clear that the Ethernet port on the Thunderbolt Display works through the "Display Ethernet" interface, rather than through the "Thunderbolt Ethernet" interface. The latter was already present in the list of network interfaces in Network Preferences, while the former had to be added via the + button --- at least that was the case when I installed the TB display to work with my 15-inch MacBook Pro Retina this week.
The AppleCare rep didn't know the difference either and agreed with me that it was puzzling that using the Thunderbolt Ethernet adapter on the Thunderbolt port of the display did work, wheras using the Ethernet port directly didn't (even though there were lights flashing on the Ethernet port of that other computer I tried to connect to in Internet Sharing mode). Close reading of the above posts made me go look for that mysterious "Display Ethernet" interface...  thank you Clinton!

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