Apple broke the Ethernet port on most Macs, but you can fix it
Thanks to Apple we have long forgotten about such things as Ethernet port. However, if you are forced to use a network port, you may have noticed that after a recent update it stopped working on many Mac computers. Colleagues from 9to5Mac reported that the update took out network port on most computers, perhaps it doesn’t work and you just you are unable to notice. Apple has officially confirmed the existence of a problem, fortunately, it’s simple enough to solve.
If your Mac is not working Ethernet port, go to the system Report menu, About this Mac. In the section ON find tab Installation. In the window Name we are interested in Incompatible Kernel Extension Configuration Data. You will probably find several items with the same name. The second column lists the version number. If the latest version on your Mac — 3.28.1, you need to update your profile. If the above version, Apple has already solved the problem for you.
If you have the ability to connect to Wi-Fi, the solution will be quite simple. You just need to open a terminal, enter the command sudo softwareupdate —background and enter the administrator password. After that you have to close the terminal and restart the computer. After the reboot, the network port must again begin to work.
If the opportunity to connect to Wi-Fi no, for you the solution is a little more complicated. You have to start the computer in recovery mode by following the instructions on the Apple support site, launch Disk utility, mount your boot disk, then use the terminal to enter the command rm-rf “/Volumes/Macintosh HD/System/Library/Extensions/AppleKextExcludeList.kext” and restart the computer. After system startup, you should perform the procedure described in the previous paragraph.