mikesgym

Q: Ethernet says "cable unplugged"

Ethernet says "cable unplugged"    I've looked at some posts... but they are older posts and say to update to 3.28.2     Mine is 3.30.1  

iMac, OS X Mountain Lion (10.8.1)

Posted on Oct 6, 2016 8:53 PM

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Q: Ethernet says "cable unplugged"

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  • by Tesserax,

    Tesserax Tesserax Oct 6, 2016 9:33 PM in response to mikesgym
    Level 9 (54,776 points)
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    Oct 6, 2016 9:33 PM in response to mikesgym

    What are you referring to by updating to 3.28.2? Where are you getting this error message? Is your iMac still running OS X Mountain Lion 10.8.1? Which exact model is your iMac?

  • by mikesgym,

    mikesgym mikesgym Oct 7, 2016 7:21 AM in response to Tesserax
    Level 1 (4 points)
    Desktops
    Oct 7, 2016 7:21 AM in response to Tesserax

    iMac  21inch   iMac 12,1         macOS Sierra version 10.12    

    error message comes when I try to connect via ethernet instead of wifi.   Worked fine up to maybe one month ago.    wifi works fine, and the cables going to the computer are ok, because other devices work when I plug them in.      

  • by Tesserax,

    Tesserax Tesserax Oct 7, 2016 9:05 AM in response to mikesgym
    Level 9 (54,776 points)
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    Oct 7, 2016 9:05 AM in response to mikesgym

    Thanks for the additional information.

     

    Please try the following steps, in order, or until resolved:

     

    Step 1

    • Open a Terminal session. The Terminal application is located in /Applications/Utilities.
    • At the command prompt, enter: ifconfig -a
    • Locate the network interface that is giving you trouble. (Note: en0 = Ethernet)
    • Look to see if Terminal indicates the problematic interface is not enabled. (Note: Enabled = flags: UP, status: active)

    CapturFiles_1.png

    • If not enabled, enter: sudo ifconfig en0 inet up
    • At the command prompt, enter: ifconfig -a
    • Verify that the problematic interface is now active and various network interface related data should now be listed.

      

    Step 2

    • In Finder, go to /Macintosh HD/Library/Preferences/SystemConfiguration
    • Move (not copy) the entire SystemConfiguration folder to the OS X desktop.
    • Restart the computer.
    • Verify that you now have connectivity.
  • by mikesgym,

    mikesgym mikesgym Oct 7, 2016 8:14 PM in response to Tesserax
    Level 1 (4 points)
    Desktops
    Oct 7, 2016 8:14 PM in response to Tesserax

    I've tried 3 times... still the same.

    en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500

      options=10b<RXCSUM,TXCSUM,VLAN_HWTAGGING,AV>

      ether 40:6c:8f:44:25:d3

      nd6 options=201<PERFORMNUD,DAD>

      media: autoselect (none)

      status: inactive

  • by Tesserax,

    Tesserax Tesserax Oct 7, 2016 9:01 PM in response to mikesgym
    Level 9 (54,776 points)
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    Oct 7, 2016 9:01 PM in response to mikesgym

    Take a look at the following 9to5Mac article to see if it can help.

  • by mikesgym,

    mikesgym mikesgym Oct 8, 2016 5:52 PM in response to Tesserax
    Level 1 (4 points)
    Desktops
    Oct 8, 2016 5:52 PM in response to Tesserax

    Sorry to be so much trouble... but that didn't help.. maybe I should give up on it.. but I can't imagine I'm the only one having this problem...

  • by CMCSK,

    CMCSK CMCSK Oct 8, 2016 6:00 PM in response to mikesgym
    Level 6 (10,870 points)
    Oct 8, 2016 6:00 PM in response to mikesgym

    mikesgym wrote:

     

    Ethernet says "cable unplugged"

     

     

    Have you tried changing ethernet cables?  What is the other end of the ethernet cable connected to besides your iMac? 

    Describe in detail your network setup.

     

     

     

     

     

     

     

     

     

     

     

     

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  • by mikesgym,

    mikesgym mikesgym Oct 8, 2016 8:52 PM in response to CMCSK
    Level 1 (4 points)
    Desktops
    Oct 8, 2016 8:52 PM in response to CMCSK

    I have changed cables. I can unhook from my computer and plug it into another device and the device works. It's a Btv for streaming movies.  

    Other end of cable is connected to a new router that is connected to a new Modem from my cable company.   The cable company installed a new modem because I was complaining. I also bought a new router. I've tried the PRAM and SMC.

  • by CMCSK,Helpful

    CMCSK CMCSK Oct 10, 2016 7:59 PM in response to mikesgym
    Level 6 (10,870 points)
    Oct 10, 2016 7:59 PM in response to mikesgym

    I suspect that a setting is incorrect in your router or the ethernet cable is set up incorrectly.

    Other end of cable is connected to a new router that is connected to a new Modem from my cable company.

    Make sure the modem ethernet cable is connect to the the LAN port on the router.  Your second ethernet cable should be connected to your Mac into an ethernet port on your router.


    Go into airport utility or whatever app your 3rd party router uses.  Go into the Network tab and make sure router mode is set to DHCP & NAT.


    When done, restart your modem and your computer.  If all else fails, you are still under warranty for your router.  If the user manual is of no help in the troubleshooting section, call them and explain your issue.  Ask them to provide step by step instructions and write them down.  Keep the instructions in a safe place.


     

     

     

     

     

     

     

     

     

     

     

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  • by mikesgym,

    mikesgym mikesgym Oct 10, 2016 7:59 PM in response to CMCSK
    Level 1 (4 points)
    Desktops
    Oct 10, 2016 7:59 PM in response to CMCSK

    I also have a mac mini...   I can plug the cable into the mac mini and it connects to the internet.  I unplug from the mini and plug into my desktop mac and it will not connect to the internet....  says "cable unplugged"  I plug it back into the mini and it connects...   I don't see how it can be a router or modem problem. I'm open to more suggestions...

  • by Tesserax,

    Tesserax Tesserax Oct 10, 2016 8:41 PM in response to mikesgym
    Level 9 (54,776 points)
    Wireless
    Oct 10, 2016 8:41 PM in response to mikesgym

    Ok, so the article stated that you would need to update the Kernel Extension Configuration from 3.28.1. It also references an Apple Support article that lets you know that you would need 3.28.2 to resolve the Ethernet port issue. That article was dated 4/15/2016.

     

    In your initial post, you stated that you already have 3.30.1. Are you sure that this is the Kernel Extension Configuration data file mentioned in the Apple Support article?

     

    Basically it comes down to one of two things: 1) The file is the wrong version, or 2) The Ethernet port on your iMac has failed.

  • by mikesgym,

    mikesgym mikesgym Oct 10, 2016 9:23 PM in response to Tesserax
    Level 1 (4 points)
    Desktops
    Oct 10, 2016 9:23 PM in response to Tesserax

    3.28.2 was installed 2/28/16            3.30.1  was installed 4/5/16

    I think it must be option 2.      The Ethernet port has failed.

    I appreciate the time and effort you have put into helping me with this.

    Many Thanks....