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If you're having problems with your Mac's Ethernet port this morning, the culprit may be an errant automatic update that Apple published over the weekend. Luckily, the damage isn't permanent: an Apple support article posted yesterday will walk you through diagnosing and fixing the problem, which involves connecting to your network via Wi-Fi and running a software update command in the Terminal. If you're reading this and your Ethernet port is working fine, odds are good that you've already installed the follow-up update released to fix the problem.
The free Xerox Global Print Driver manages Xerox and non-Xerox printers on your network with a single, easy-to-use interface. It dramatically simplifies enterprise printer management for IT managers, making it easy to add and update printers without changing drivers. Ethernet stopped working after updating to el captain OS X10.11.5 but wifi and other network are working what could real be a problem here? More Less Jun 7, 2016 5:55 PM. Realtek Ethernet Drivers For El Captain? Thats a No Go For The 2.0 Driver, could it be something else? I have to use npci 0x2000 to boot also have the rootless=0 and kext-dev-mode=1 in the args. I am going to take a look at my bios to see if there is any options showing there. Anything else to lookout for?
The culprit is an update for System Integrity Protection, the El Capitan feature that protects some system folders and keeps unsigned or incorrectly signed kernel extensions (or 'kexts,' roughly analogous to drivers in a Windows or Linux machine) from loading. In this case, the kext used to enable the Ethernet port on Macs was blacklisted—if you restarted your Mac after applying this update but before your computer had a chance to download the quickly issued fix, you'll find yourself without an Ethernet connection.
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This blacklist isn't updated through the Mac App Store like purchased apps or OS X itself. Rather, it uses a silent auto-update mechanism that executes in the background even if you haven't enabled normal automatic updates. Apple uses a similar mechanism to update OS X's anti-malware blacklist, a rudimentary security feature introduced in 2011 following the high-profile Mac Defender malware infection and occasionally used to push other critical software updates.
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Why Apple blacklisted its own Ethernet kernel extension is anyone's guess; one theory suggests that the update may have been intended to go live after the release of OS X 10.11.4, which could include a newer patched kext. Whether it was an outright mistake or a well-intentioned update that was released too early, the end result is inconvenience for users.