Ethernet disabled with software update for 10.11 El Capitan
Scope of the problem:
Apple recently issued a firmware update that has disabled the Ethernet port on Apple computers running Mac OS 10.11 with an Ethernet port, I have not heard if it affects the Mini Display Port to Thunderbolt adapter. Affected computers will not be able to connect via Ethernet on Mac OS 10.11.
Apple has issued a KB article on how to restore the port [Ethernet Fix KB...](https://support.apple.com/en-us/HT205956 )Just click on the link and follow the steps to restore ethernet functionality. It is fairly easy and takes just a few minutes.
If a user is not successful at bring back the Ethernet port to full functionality please have them create a HelpDesk ticket so we can follow up and solve the problem. Hint: Have them turn on wireless if they need to connect to the Internet.