• Apple confirms OS X update broke Ethernet port on some Macs

    Apple has now officially acknowledged the problem on its support pages. Luckily, the software problem isn’t permanent and the bug can be resolved.

    Apple has already fixed the Ethernet software problem for users going forward. Here’s the fix if you were affected …

    If your Ethernet port has stopped working on your Mac, check System Information to find the version number of the Incompatible Kernel Extension Configuration file installed. If the number reads 3.28.1, you’ll need to update the configuration to get the Ethernet port working properly. It seems that Apple accidentally blacklisted its own networking kext, which is the cause of the issue.

    To check your Incompatible Kernel Extension Configuration version number, hold the Option key and click the Apple menu. Then open System Information. Find the Software section and select Installations. Look for rows labelled ‘Incompatible Kernel Extension Configuration Data’ and find the most recent version installed. If the number is 3.28.1, you need to update the profile.

    If you can connect to WiFi, then luckily updating the file to restore the functionality of the Ethernet cable is easy. Open Terminal. Type the following command into the command line; it will ask for your admin password:

    sudo softwareupdate --background
    Quit Terminal and restart the Mac. After rebooting, the Ethernet port should work again. If you can’t connect to WiFi, the steps are a bit more involved. You’ll have to restart the Mac in Recovery mode and manually delete the offending files through Disk Utility and Terminal.

    rm -rf “/Volumes/Macintosh HD/System/Library/Extensions/AppleKextExcludeList.kext”
    Read the full steps on Apple’s Support Site and take care not to delete anything but the file in question. If you don’t mind losing data, it may be simpler to use Recovery Mode to just Reinstall OS X. This will fix the problem when OS X is started afresh, but obviously has the big downside of deleting other data. Make sure you have recent backups in any case.

    Original Source
    This article was originally published in forum thread: Apple confirms OS X update broke Ethernet port on some Macs started by Caiden Spencer View original post
    Comments 1 Comment
    1. csglinux's Avatar
      csglinux -
      I wish I'd read this article this morning. Oh wait, I couldn't have, because my ethernet wasn't working... :-(
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