Ethernet Has Disappeared From My iMac

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Ethernet Has Disappeared From My iMac

Papa Gordie
Recently I discovered that my Ethernet connection disappeared from my iMac. I know there was a previous OS update that killed Ethernet on some machines but I have not seen anything similar relating to either Sierra or High Sierra. I also cannot pinpoint when it ceased to work other than no earlier than Sierra.

Looking at:

System Preferences -> Network

it indicates that Ethernet is not connected although it definitely is. Different cables, restarting my iMac, and restarting my ISP’s modem bring the same result.

Also in the Pref Pane:

"Either the cable for Ethernet is not plugged in or the device at the other end is not responding.”

I know the device at the other end is responding because at the moment I have a USB Ethernet Gbit adapter connected and it functions.

I have run the Apple Hardware Test and so far that has returned no error. I have not performed the seriously extended test but likely will try that tonight.

Not that I really thought it would make much difference I did reset the SMC and NVRAM.

Is there any other way than Apple Hardware Test to confirm if the Ethernet port is dead?

Anyone have any other thoughts ?

Gord


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Re: Ethernet Has Disappeared From My iMac

M.Crump
Try looking at the ipconfig or the netstat -r commands in Terminal. Make sure your ipconfig is saying that your Ethernet is tied to eth0 and that netstat provides you the IP address of your router correctly. I hope others chime in with more detailed usage of said commands. Thanks! 

On Fri, Oct 20, 2017 at 5:37 PM Papa Gordie <[hidden email]> wrote:
Recently I discovered that my Ethernet connection disappeared from my iMac. I know there was a previous OS update that killed Ethernet on some machines but I have not seen anything similar relating to either Sierra or High Sierra. I also cannot pinpoint when it ceased to work other than no earlier than Sierra.

Looking at:

System Preferences -> Network

it indicates that Ethernet is not connected although it definitely is. Different cables, restarting my iMac, and restarting my ISP’s modem bring the same result.

Also in the Pref Pane:

"Either the cable for Ethernet is not plugged in or the device at the other end is not responding.”

I know the device at the other end is responding because at the moment I have a USB Ethernet Gbit adapter connected and it functions.

I have run the Apple Hardware Test and so far that has returned no error. I have not performed the seriously extended test but likely will try that tonight.

Not that I really thought it would make much difference I did reset the SMC and NVRAM.

Is there any other way than Apple Hardware Test to confirm if the Ethernet port is dead?

Anyone have any other thoughts ?

Gord


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Re: Ethernet Has Disappeared From My iMac

James R Cutler
In reply to this post by Papa Gordie
My usual technique is to use System Preferences > Network to delete the interface and re-add it — the same in High Sierra or Sierra as in older OS X instances.

Another technique is to find and delete all related plist files. Then reconfigure lots of things. This is a bit more convoluted. I try to NOT ever use it.

Jim

On Oct 20, 2017, at 5:34 PM, Papa Gordie <[hidden email]> wrote:

Recently I discovered that my Ethernet connection disappeared from my iMac. I know there was a previous OS update that killed Ethernet on some machines but I have not seen anything similar relating to either Sierra or High Sierra. I also cannot pinpoint when it ceased to work other than no earlier than Sierra.

Looking at:

System Preferences -> Network

it indicates that Ethernet is not connected although it definitely is. Different cables, restarting my iMac, and restarting my ISP’s modem bring the same result.

Also in the Pref Pane:

"Either the cable for Ethernet is not plugged in or the device at the other end is not responding.”

I know the device at the other end is responding because at the moment I have a USB Ethernet Gbit adapter connected and it functions.

I have run the Apple Hardware Test and so far that has returned no error. I have not performed the seriously extended test but likely will try that tonight.

Not that I really thought it would make much difference I did reset the SMC and NVRAM.

Is there any other way than Apple Hardware Test to confirm if the Ethernet port is dead?

Anyone have any other thoughts ?

Gord


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James R. Cutler
PGP keys at http://pgp.mit.edu






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Re: Ethernet Has Disappeared From My iMac

Papa Gordie
On Oct 20 2017 at 16:37:39 James R Cutler <[hidden email]> wrote:

My usual technique is to use System Preferences > Network to delete the interface and re-add it — the same in High Sierra or Sierra as in older OS X instances.

Another technique is to find and delete all related plist files. Then reconfigure lots of things. This is a bit more convoluted. I try to NOT ever use it.

Jim

On Oct 20, 2017, at 5:34 PM, Papa Gordie <[hidden email]> wrote:

Recently I discovered that my Ethernet connection disappeared from my iMac.

I apologize for neglecting to mention that I had done both of these. I deleted the prefs here:

Library/Preferences/SystemConfiguration

and deleted and re-added the Service in the Network Pane. Obviously that brought no joy.

Gord






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Re: Ethernet Has Disappeared From My iMac

Papa Gordie
In reply to this post by M.Crump
On Oct 20 2017 at 16:12:17 M.Crump <[hidden email]> wrote:

Try looking at the ipconfig or the netstat -r commands in Terminal. Make sure your ipconfig is saying that your Ethernet is tied to eth0 and that netstat provides you the IP address of your router correctly. I hope others chime in with more detailed usage of said commands. Thanks! 

On Fri, Oct 20, 2017 at 5:37 PM Papa Gordie <[hidden email]> wrote:
Recently I discovered that my Ethernet connection disappeared from my iMac.

I am not familiar with those Terminal commands so will check the Man pages and go from there. Thanks.

Gord



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Re: Ethernet Has Disappeared From My iMac

Josh Cockey
In reply to this post by Papa Gordie
Three things to try.

1. Check that your ethernet cable is securely plugged in to your computer and router.
2. Plug the ethernet cable into a different router port.
3. Try using a different ethernet cable.

Josh

On Fri, Oct 20, 2017 at 5:37 PM Papa Gordie <[hidden email]> wrote:

> Recently I discovered that my Ethernet connection disappeared from my
> iMac. I know there was a previous OS update that killed Ethernet on some
> machines but I have not seen anything similar relating to either Sierra or
> High Sierra. I also cannot pinpoint when it ceased to work other than no
> earlier than Sierra.
>

--
"Any sufficiently advanced technology is indistinguishable from magic."
-- Arthur C. Clarke

 Josh Cockey  |  E-Mail: [hidden email][hidden email]



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