Thunderbolt Ethernet not working after Yosemite upgrade

Thanks TimPetro, you saved my day. My problems did not start after a Yosemite upgrade however - they came to be because I started cleaning up - in my Network Settings I had removed Thunderbolt Ethernet 2, 3 and 4 which somehow had been created over the years.

Reading your fix and other comments it seems to me that the 'old' approach of networking, with locations that you can set, is likely the root of this type of problems. In any case it is not applicable to me, so I removed all locations and am sticking to Automatic.

Thanks again & cheers --Mike

TimPetro,

➕ ✅ 🙂 😁 😝 😉 😎 😀 😍 ✅ ➕

Thank you SO MUCH for taking the time to detail this.

I don't think it is directly to do with the Yosemite upgrade. I agree with mcarpentier - I think anyone who had been setting and changing locations will most likely get this problem sooner or later. I think the upgrade just made it happen more often.

Thanks again, you saved my sanity!

Richard

Tim,

You are a star. I followed your instructions to the letter, and finally my Thunderbolt adaptor is working. I cannot thank you enough!

Tim's is the only advice that worked for me too. Thanks Tim! In my case I didn't have anything but Automatic as a Location so the other method did not help me.

Regards,

Ryan

Hi Dan,

I just followed your clear, concise directions for the fix.

Worked like a charm.

Many thanks,

PF

Thank you, wise221! Totally saved me, and it was quick. Tried U-verse tech support first and they told me it was a bad port or cable, which I *knew* was wrong. *High Five* 🙂

Perfect, Tims solution also work in case of the Problem when upgrade to 10.11 "El Capitan", but it need to make a new "Thunderbolt-conection" in the Network Preferences.

Wise221,

This cleared the problem for me too. In the Network tool, a new item immediately appeared "Thunde...thernet" that connected when the Ethernet cable was inserted into the adapter.

Thank you.

Phil

This worked for me as well. Same system specs.

Hello to all. Unfortunately I cannot say that I have the problem solved. I tried everything until now and... nothing. I tried my cable on a friends computer and it works perfectly. I really don't know what to do. can someone help? thx

Thank you

This worked for me! Thanks so much Tim. My Thunderbolt ethernet stopped working after El Capitan update. It initially did not show in system information, but that got fixed after a PVRAM reset. But the network preferences list only showed Thunder Bolt 1/2/Bridge. It was this solution which finally helped. Though in my case, after editing the file, I had to do one more PVRAM reset as the bus disappeared again from system info. Other solutions like completely deleting the NetworkInterfaces.plist did not work.

Thanks again Tim!

In my case (cable was detected but did not automatically get an IP number) the problem was Sharing. In the System Preferences/Sharing panel I had enabled sharing the "Display Ethernet" interface. After disabling Internet sharing, it worked fine.

hello tim petro and dan2bit

TimPetroMay 5, 2015 12:28 PM Re: Thunderbolt Ethernet not working after Yosemite upgrade

in response to dan2bit

i just had the same problem: my macbook Pro retina under actual el capitan did not recognise my thunderbolt adapter. with an older version from yosemite (which i saved earlier last year before updating to el capitan) it was still recognised. so i tried your advice above "delete all sections". after rebooting and a minute to wait, it works now! thunderbolt adapter to ethernet is now recognised again!!! thanks a lot, now i can cancel my date at the genius bar

regards from frankfurt germany

winfried

I downloaded an update to Skype yesterday from MacUpdate taking care to access it only on the download link. I received MacKeeper as well surreptitiously. After removing it (a several step process) my system reported that my Ethernet cable was unplugged (although it was connected via a Thunderbolt adapter). I spent much time with my ISP on the phone -- to no avail -- and then I tried your suggestions regarding using Automatic. They worked and now my cable connection is OK. I'm identifying this with the install and subsequent uninstall of MacKeeper even though it was never used because everything worked fine before that. Many thanks and be wary of downloads from MacUpdate (most are OK but it only takes one...)