![]() ![]() You’ll have to set up your AirPort networking carefully again, in all probability, but your Mac should then forget that it ever had an Ethernet port. While you’re there, it is often helpful to move /Library/Preferences/SystemConfiguration/ist too. ![]() To fix this ‘good and proper’, you then need to remove at least one preference file: /Library/Preferences/SystemConfiguration/ist to be precise. However, if you were just to restart your Mac now, it would probably still think it should have an Ethernet port somewhere, and your authorisation problem would remain. Select it in the list, and click on the – tool at the foot of the list. The best approach is to remove Ethernet from the list of network connections in the Network pane. If you have tried to work out what is wrong, in the hope of discovering a way to reactivate your Ethernet port, but got nowhere, you’ll probably want to get your Mac authorised again, and able to access all those apps which you paid for. With the Ethernet port gone – whether by software or hardware damage – almost every paid-for App Store app is disabled, and you’ll start getting bombarded with Apple ID warnings. What you don’t realise is that, even though your Mac may not use it to connect to your network, that Ethernet port is crucial for your Mac to be recognised by the App Store, and for your Apple ID. Until it happens to you, losing an Ethernet port in this way seems a trifling inconvenience: turn AirPort on, and carry on as if nothing had happened, until Apple comes up with a fix. I was one of those affected, and understandably unimpressed. Just over eighteen months ago, Apple pushed out a silent security update to its Incompatible Kernel Extension Configuration Data, which blocked loading of the kernel extension responsible for making the Ethernet port work on some models of Mac. ![]()
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