You can fix the problem with a single Terminal command

Copy and paste this command into Terminal: sudo softwareupdate -background.If your Mac shows version 3.28.1, here's what to do: What you don't want to see is version 3.28.1.Find Incompatible Kernel Extension Configuration Data in the list on the right.Click Software in the left column to expand its view.Option-click the Apple menu, then choose System Information.You'll need to check your Ethernet kernel extension version to see it's time to do a little under the hood fix. If WiFi is turned on and your Mac has previously joined your wireless network, it's possible your Ethernet port is inactive and you don't even know.Īpple's accidental kernel extension issue disables your Mac's Ethernet port The problem is that Apple tagged the Ethernet kernel extension as invalid. In some cases, that also led to Mac App Store connection issues, but there is a fix. Some Mac users who use wired network connections got an unwelcome surprise recently when Apple accidentally disabled their built-in Ethernet port.

Mac ethernet problems