Mac OS X 10.13.6 Killed my Ethernet Connection

I just successfully downloaded and installed the 10.13.6 update and immediately following the reboot of my iMac Pro, my Ethernet connection is no longer functioning. If I manually pull the ethernet cable out of the back of the computer and connect using either WiFi 5G or 2.4G, I get connected to the Internet. Has anyone else had this problem? I've restarted my Asus router and DrayTek Vigor 130 modem twice, but to no avail. My wife's MacBook Air, which is still running 10.13.5, is connected to Ethernet via the Display Ethernet (to the same Asus router) and is running fine. Help! I can get by using the 5G WiFi but would obviously like to be able to use my ethernet connection as my main one.

Erik Lars Hansen

iMac Pro, macOS High Sierra (10.13.6), Drobo drive stack attached

Posted on Jul 10, 2018 4:26 PM

Top-ranking reply

Luis Sequeira1

Level 9

73,500 points

Posted on Jul 12, 2018 1:34 AM

Lownote wrote:

I downloaded and ran the Combo 10.13.6 update but Ethernet connection is still not working to the Internet. Very frustrating. I'll call Apple Support again tomorrow to see if they can help me get this fixed. Strangely, during the first Support phone section, Ethernet connection worked while we were in a Recovery mode and launched Safari. I guess that proves that the Ethernet port hardware itself is working.

Yes, and it suggests that probably some of the software running is causing a conflict.

A few things to try:

- recheck all the settings in System Preferences->Network

- login to a new user account, and check if Ethernet is working correctly there

- start in Safe Mode, login to your normal account, see if it is working

- run Etrecheck from your normal user account and post its report here

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21 replies

Lownote Author

Level 1

44 points

Jul 11, 2018 4:39 AM in response to askbarnabas

Hunh?! It's the Ethernet connection that is not working. My iMac with no longer connect to the Internet via Ethernet--it only works on WiFi after the upgrade to High Sierra v6.

Lownote Author

Level 1

44 points

Jul 11, 2018 5:22 AM in response to Luis Sequeira1

I'll try the combo update because Ethernet is still not working on my iMac while my wife's computer has no problem connecting with ethernet to the same router. Thanks.

Aug 5, 2018 10:18 AM in response to Lownote

I just applied this update to my macbook pro:

About the macOS High Sierra 10.13.6 Update - Apple Support

After the restart my wired internet (USB C with ethernet adapter) doesn't work at all.

Aug 22, 2018 8:34 AM in response to Luis Sequeira1

Sorry for slow follow-up. By the time I went back to that unit to check network configs (within about an hour or posting), the wired network connection was working, and has worked since.

Lownote Author

Level 1

44 points

Jul 20, 2018 7:30 AM in response to Luis Sequeira1

Thanks for the reply and sorry for my delayed response—have been traveling with no time to work on the problem. On 1st call to Apple Support we tried a new user and started in safe mode. Ethernet connectivity was still not working. When I can get back to my computer I'll run Etrecheck and will also call Apple Support back. At least my 5 go WiFi is working so that I’m experiencing much of any reduction in speed.

JgTorpe

Level 1

4 points

Jul 20, 2018 6:31 AM in response to Lownote

The combo pack update did not work... only rebooting into Safe Mode gives the Ethernet Port connectivity.

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Mac OS X 10.13.6 Killed my Ethernet Connection