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Apple confirms mac os x update broke Ethernet ports

Apple's latest software update for Macs had an unintended consequence: it broke Ethernet network ports for some older Mac computers, meaning that people couldn't use wired internet connections. 9to5Mac is reporting that Apple confirmed the issue and has fixed it.
Desktop Mac computers and older MacBooks came with Ethernet sockets that allowed computers to use a wired internet connection instead of Wi-Fi. But many customers found that these ports suddenly stopped working last week.
Apple accidentally blocked its own networking code, so computers rejected the Ethernet port. It wasn't a hardware issue - just a problem with the software, which has now been updated.
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.