Thunderbolt ethernet not working after upgrading to Yosemite

After a very long and frustrating 2 days I have managed to upgrade my MacBook Air (13 Inch, Early 2014) to Yosemite. I have the official Apple thunderbolt to ethernet adapter but System Preferences/Network reports that the cable has been disconnected. It has not and other devices connected to the ethernet cable work fine. Any suggestions to get it working? Anyone else having the same problem?

I have a similar problem. My Macbook Pro Retina 15" (1st generation) can no longer connect to my university network through a Thunderbolt-to-Ethernet adapter since upgrading to Yosemite. (Actually, OSX 10.9 on a different machine altogether also has the same problem -- tested and verified.) I tried multiple dongles and multiple Ethernet cables, and finally called our tech support. We found a workaround for the problem by purchasing a USB to Ethernet adapter, but this now means that instead of a single device chain leading into the laptop, I am now using multiple ports. I hope a patch for this is in the works.

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Follow these steps:
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CONFIGURATION: DEFAULT
TELEPHONE NUMBER : #99*
leave account name and password columns blank
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I am unable to use the other which might the registered Apple Id since the option to log in does not appear. What do I do?
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the link provide above leads to http://plugable.com/2014/10/31/os-x-10-10-yosemite-ethernet-adapter-problems-we- can-help
...but these seem to be all 3rd party USB ethernet adapters and nothing to do with the Thunderbolt adapter of the thread - or am I missing something?
I have the same blooming problem, it seems to be totally hit and miss whether the adapter works or not.
I thought is was a faulty adapter, so even bought a second one for my MacBook Pro, so a bit more profit for the most profitable company in the world for a non working device. My ethernet cable works fine to an old apple USB adapter but is 90% useless with Thunderbolt.
Renewing the DHCP lease occasionally works, but totally unreliable, at the moment it fails.
Still looking for a reliable solution.
Come on Apple, please sort this out, you have a connector policy of turning everything you can into adapters and dongles rather than building them in, so you end up with a slim laptop and a bag of adapters to carry around, and then when they don't even work - doubly annoying.

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After I plug in and out headset I loose even internal sound for Spotify.
When headset is plugged in Youtube videos on Chrome stops playing, when I take them out - video resumes.
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Hello Michael Dixon2,
Thanks for using Apple Support Communities.
In order to troubleshoot this issue where the optical drive does not accept discs, please follow the steps below.
Doesn't accept discs
Be sure to check your disc to make sure it is flat. You can check this by putting the disc upside-down on a flat surface. If the disc is bowed up on any side or in the center, do not use the disc because it might get stuck in the drive. Do not use discs that have anything attached to them or dangling from them (such as "sweeper" or cleaning discs).
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Reset the System Management Controller (SMC).
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Apple Computers: Troubleshooting the slot-loading SuperDrive - Apple Support
Cheers,
Alex H.

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Hello
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Hello
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Thunderbolt ethernet not working after upgrading to Yosemite

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