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Level 1

46 points

Dropping Ethernet Connection on Big Sur

I have a 2020 27" iMac running Big Sur 11.1. I have hard-wired ethernet from my modem to my iMac with a gigabit connection AND also a Wi-Fi connection as well. Ever since I downloaded Big Sur I lose connection to the internet 1-3 times per day for no apparent reason. I can still access the internet on other devices, so it's not that. It's just the iMac that loses the connection. If I restart the iMac everything is fine until a few hours later when it will lose connection again for no reason. Any ideas? Thanks!

Posted on Dec 17, 2020 11:48 AM

Best reply

Wangwang

Level 1

13 points

Posted on Jan 20, 2021 8:09 PM

I had the same problem with my 2020 27' iMac ever since I upgraded to Big Sur.

However it has been good now ever since I did the following change:

Go to "Network" setup and create a new "location" for the internet.

Go to "Energy Saver" setup and only tick the following options:

Hope it can help your iMac as well.

Apple really should look into this issue ASAP. It is very annoying and frustrating for users...

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209 replies

Jun 15, 2021 9:56 AM in response to mr_ggg

no problem at all @mr_ggg, glad the script is working

ablyes

Level 1

6 points

Jun 29, 2021 6:20 AM in response to Murphy5156

I have the same problem with my macbook pro 2016, Big Sur 11.4

Always have to unplug/plug the usb.

I have a noname adapter, but it's also the case (or even worse) with my CalDigit TS3Plus.

Jul 28, 2021 10:42 AM in response to Murphy5156

Is this bug of Big Sur network interfaces regular drop down on timeout fixed now?

Which version of Big Sur corrected this bug?

Chasvero

Level 1

8 points

Aug 4, 2021 6:47 PM in response to Chasvero

I'm going to upgrade to 11.5 to see what happens with the ethernet issue

drmhv

Level 1

12 points

Aug 7, 2021 2:06 PM in response to Steffel

Interesting, Steffel -- does it happen seemingly at random, or are there certain traffic types that trip it more than others?

jjfromn

Level 1

20 points

Aug 9, 2021 8:43 AM in response to Steffel

Had the same experience so I switched to a Thunderbolt connected hub and problem was solved. Apple Store has them (CalDigit) at great price.

Aug 10, 2021 1:55 AM in response to Steffel

What specific versions of Big Sur?

I had problems with Ethernet in earlier versions but not in 11.4 or 11.5.1.

Steffel

Level 1

5 points

Aug 10, 2021 3:18 AM in response to Luis Sequeira1

ALL versions of Big Sur. Of course we always try the latest version in hope they finally corrected this or these bugs.

Steffel

Level 1

5 points

Aug 12, 2021 5:26 AM in response to Steffel

Now on Version 11.5.2 and still no working built in Ethernet. Oh Apple, that's really poor!

drmhv

Level 1

12 points

Aug 14, 2021 1:13 PM in response to Steffel

Did Wireshark turn up anything interesting?

Steffel

Level 1

5 points

Aug 16, 2021 2:36 AM in response to drmhv

I didn't try Wireshark yet due to time constraints. However the new MTU setting of 1501 still works on all four machines for normal network and Internet connection so far without any problem.

drmhv

Level 1

12 points

Sep 24, 2021 2:15 PM in response to macdawg54

Disabling IPv6 had no effect on my NFSv4/Finder issue.

Jan 25, 2022 4:30 AM in response to magisz

This thread is about Ethernet connection drops, not Wi-Fi connection drops.

I suggest you to make an independant question so as to get helpful answers.

Feb 6, 2022 10:07 AM in response to Murphy5156

To the author of this thread: @Murphy5156.

Is this problem fixed on Big Sur?

If yes, which version of Big Sur fixed this Ethernet connection bug?

Dropping Ethernet Connection on Big Sur