Ethernet adapter not working with big sur update?

Same for me. Just updated to Big Sur and ethernet connection not working. Not exactly brilliant work from Apple given how many people must be relying on an internet connection for working at home right now. Wish I hadn't upgraded.

I'm having the same problem with my iMac 27" 2017. I have I think that it has something to do with going to sleep and then does not wake up the ethernet port. If I disconnect the ethernet cable it works fine on WiFi. I have Spectrum 1gb service.

hi.

I have a new macbook air 2020 version with m1 chip.

I have both this adapters... and they both works great!

https://www.ebay.com/itm/LENTION-USB-C-HUB-Thunderbolt-3-to-USB-3-0-HDMI-Ethernet-PD-Adapter-Card-Reader/324246025044?hash=item4b7e91b354:g:jDUAAOSwnQFcuZ8n

and

https://www.apple.com/shop/product/HJKF2ZM/A/belkin-usb-c-to-gigabit-ethernet-adapter?fnode=cdf4973f641d03127b9740fba19eb6e41768479e8762a052d1b10d5fccbe7384610180db6153b2725f73728ac08c9c3f546dfca2d7c8e8fecbc51c0cc23abb8406349964f1475d4a380df0dc999d561ec315598f20cc89250cfed139ef6899ed41a1919cd5d10a7e0744546f5338eca6

hope it helps

Hey Duane Deal,

this works with my iMac! It is not a solution but a workaround, because some users will need AVB and some network clients are not compatible with Jumbo frames.

I spent days researching for a solution. This definitely was one.

Apple, why don't you check all the basic functions like the built in Ethernet hardware before you release a new system? This one is already version 11.2 and not 11 alpha or beta! Apple becomes more and more like Windows regarding the software quality. Please correct this incompatibility issue with your own hardware chip Broadcom 57766-A1 that you use in the iMac. Some people will need AVB and some can't use Jumbo frames in their environment.

I’ve had this problem both before and after Big Sur as well as with 2017 macbook and 2020 MacBook Pro.

Works for about 20 minutes and then freezes. Don’t know if single adapter vs hub type adapter will solve problem. That will mean 4 adapters, one for each USB-C port.

Im having the same problem on my j5create JUD380, USB 3 to Gigabit Ethernet on my 2017 MacBook Air. I’d rather Apple fix this problem so I don’t need to throw another $80 at equipment in the future for the same equipment I have right now.

I think it would be a good idea for Apple to comment directly on this and let us know when their hardware will work again with their software (Big Sur).

We all do not have ancient computers and they were all built by Apple. It is actually the least BEFORE the release of a new system software to make sure the existing own hardware works with it, so that such rudimentary functions such as Ethernet in a 2019 iMac are safely guaranteed to work by 100% in the beginning of 2021.

I have more than twenty Macs in my company and I cannot update them to Big Sur, because they all have the same Ethernet hardware. We are not in beta anymore and the version is not 11.0 but 11.2.1 already.

So Apple, when will you solve this big problem?

If anyone has an option for USB 3.0 Ethernet connection to a USB port, please let me know. I cannot find an Ethernet adapter for USB 3.0 compatible with Apple OS Big Sur 11.0. i know that the thunderbolt Ethernet Gig adapter works fine for Big Sur --- BUT -- my Macbook Air 2017 has only one Thunderbolt port which i use to run my external monitor.

By releasing Big Sur without a USB 3.0 ethernet adapter compatible with Big Sur, Apple has made my 2017 Macbook Air nearly obsolete. that used to be a Microsoft move which drove a lot of frustrated Windows users to Apple. Now Apple is doing the same user unfriendly moves and we have no options.

what is your download speed with your Belken Hub and Apple USB 2.0 Ethernet adapter? I believe it would be only about 92 Mbps instead of a higher speed of about 236 Mbps with a USB 3.0 Ethernet adapter. Apple does not make a USB 3.0 adapter and other providers of Ethernet USB 3.0 adapters are not compatible with Apple OS Big Sur 11.0.

thank you again OneEskimo. i will check out the QGeeM adapter you describe. It sounds like the right adapter.

I will contact the company too to see how compatible they think it is and if they have any workaround suggestions. Ditto for Apple Support about the install i would do.

I am not sure what a clean install is, but i will move up the learning curve. Usually i do not mess with software hacks. I am more a plug-n-play and update-the-driver kind of guy.

Net net, i'm on the road to find out. i'll let you know how it goes. Best to you

Steffel, thank you for your very helpful and illuminating comment. We can only hope that the Apple powers-that-be not only saw your post but are working on this continuing frustrating problem with focus, dedication, and speed. When did Apple Microsoft?

The articulated solutions i have seen on this Apple Community chat are daunting and complicated.

One hopeful note, however, is my wife's 2020 iMac 21.5 inch seems to work fine with Big Sur without any special adapters or gymnastics. She downloaded Big Sur by accident one week ago and i was prepared for a nightmare .....but it was a very nice surprise --- everything works!! .... including Office 365 for Mac, a 5-year old HP printer and a 4-year old WD My Passport for Mac backup for Time Machine. She is on ethernet with great speeds up and down. go figure.

Please let us know if something meaningful--and hopefully positive--- happens in your world regarding Ethernet and Big Sur. Best regards

Hi Steffel

You got a pretty impressive network. The MacOs update is 32 bit to 64 bit transformation with no small change with regard to third party software. Clean installs might be required for MacOS update for Client ethernet Macs but not without input from your 3rd party database technical support. Yes, you may have ethernet problems with your client Macs but your M1 mac book tells me something else. You should start here https://doc.4d.com/4Dv15/4D/15.6/Using-4D-Server-64-bit-version-OS-X.300-3838955.en.html and consult your third party software manufacturer, for 32 bit to 64 bit conversion requires some attention to detail. After interpreting wether your server has been set up as a 32 bit to 64 bit first then may I suggest getting your M1 working, then, followed by doing a clean install only one of the client Macs before jumping to the whole network. As as former IT manager of computer a network, that is the only way to approach major updates to a complicated multi-platform network.

Highest regards.....

OneEskimo

Hmm, as there is no reply from Apple, is there anybody out there with an iMac (Retina 5K, 27-inch, 2017) running on Big Sur 11.2.3 that has a working built-in Ethernet port ? It would be great to know if so! Maybe we have bought a a bad batch of iMacs?

Regards

Steffel

please tell us what Ethernet adapter do you use? maker, model number, format (i.e. USB A, USB C, lightning, thunderbolt, etc. ) iteration (is it version 2.0? 3.0?).

that info is very helpful for those of us trying to purchase a 3rd party adapter that will work with Big Sur 11.3.

thank you