Thunderbolt to Ethernet Adaptor Issue

Hello,
These are the specs for the machine:
Macbook Air
Mac OS X 10.7.5
Processor 1.7 GHz Intel Core i5
4GB 1333 MHz DDR2
13-inch, Mid-2011
Recently, the owner of the machine bought a Thunderbolt to Gigabit Ethernet Adaptor, however, upon plugging it in, nothing happens. They have tried it with several different ethernet cables, different networks, and even exchanged the adaptor in case of that being the problem. The adaptor is recognized in System Information when it's plugged in, and Thunderbolt Ethernet is now an option under Network in System Preferences, but it still says not connected even when the ethernet cable is plugged in. Assistance in this matter would be greatly appreciated.
Thank you.

What finally worked for me was noticing that "Bluetooth PAN" was connected and letting me browse, when I wasn't actually connected to a Bluetooth PAN device! Turns out my Mac was confused, calling the connection Bluetooth PAN when it was actually the Display Ethernet.
I disconnected the display, deleted Display Ethermet, Display FireWire, and Bluetooth PAN. Apply, the plugged the display back in. Then added back the Display Ethernet and Apply. Presto, works fine now.

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Powerline adaptors are tricky things, as they rely on your mains wiring to carry the signal. All sorts of things can affect the signal strength, and consequently the speed.
Interference from nearby appliances can affect the signal. If possible, try another socket in the room.
As a general rule, sockets on the same ring are best. The adaptors should work on different rings off the same consumer unit (mine do), but at a lower speed.
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Can the Gigabit Ethernet LAN Port be used with a Thunderbolt to Gigabit Ethernet adaptor and then to a Thunderbolt Hard Drive as a back up drive?

Can the Gigabit Ethernet LAN Port be used with a Thunderbolt to Gigabit Ethernet adaptor and then to a Thunderbolt Hard Drive as a back up drive?

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Message was edited by: Bob Timmons

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So I've noticed similar behaviour on my Macbook Air. It's a slightly different set of kit, since it's connected to a Belkin Thunderbolt Express Dock (http://www.belkin.com/uk/p/P-F4U055/). I'm on my second one of these because first one went back because it kept on dropping the internet connection (sounds familiar?) - and it *might* have been occurring when waking the system from sleep (I didn't make a mental note).
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It is a TB-to-Ethernet adapter, not an Ethernet-to-TB adapter. There are protocol issues, too. A TB-to-Ethernet adapter takes Ethernet frames in/out and passes them to your Mac's TB bridge (you can see it in System Preferences -> Network). The Ethernet port/driver cannot convert ethernet frames into TB packets.
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The transfer speed will be governed by the slowest link in the chain. Fire wire theoretically is twice as fast as USB 2.
Ciao.

Thunderbolt to Ethernet Adaptor Issue

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