Fix: Mac OS X High Sierra Upgrade – No WiFi Internet After
If you recently upgraded to Mac OS X High Sierra (10.13.1), you may not be able to connect to the Internet (over Wi-Fi or Ethernet) including unable to browse web pages or open the App Store. Additionally, your Mac will display “green” in System Preferences and show a connected Wi-Fi signal indicating you have a network connection, however you cannot reach the Internet. The issue is likely related to corrupt network preference files from the previous version of Mac OS you upgraded from. Follow the steps below to reset your network settings.
Note: Removing and re-adding the network connection in network preferences does not work.
- On your Mac, select from the Finder Menu Go -> Go To Folder… and type in the following path. Hit Go.
/Library/Preferences/SystemConfiguration
- Delete the following files in the SystemConfiguration folder. You may be prompted to enter your Mac OS X password.
com.apple.accounts.exists.plist com.apple.airport.preferences.plist com.apple.network.eapolclient.configuration.plist com.apple.smb.server.plist NetworkInterfaces.plist preferences.plist
- Restart your Mac.
Try to connect to either Wi-Fi or an Ethernet cable and accessing the Internet. This should resolve your Mac OS High Sierra Upgrade Internet connection issues.
Please use the comment form below to let us know if you are experiencing the issue.
Comments 75
Deleting the Net Nanny ktext files and ALL of my system/library extension files finally got me connected again. thank you to the hero that discovered this
Thank you!!!!!!
Doing the top fix and deleting netnanny kext file in System/Library/Extensions worked!!!
Used Dawn’s fix posted on 11/21/17 with one small adjustment... had to go to System/library/extensions and delete 1 NetNanny kext file from that folder.
did the trick for me! Thank you Dawn!
This worked like a charm for me after so many other options hadn't. Basically you had me remove a few additional files before rebooting, and whatever extra ones I deleted made the difference vs. what everyone else suggested.
Thanks!
Well that worked - am amazed - but why can’t Apple fix this ridiculous mistake??
Deleting those kext files did it! I have been going crazy with this! Thank you!!!!
This worked immediately on my late-2011 Mac when I updated to High Sierra and couldn’t connect to the internet. Every time I update my OS over the last 3 years, I’ve been sans internet after every install. Thanks for saving me hours of calls to Apple. It’s a Christmas miracle!!!
To my surprise this has sorted out my WiFi internet connection problems. Can someone tell Apple and get them to sort it before others suffer this problem.
Also note that there are 2 extension folders
MacintoshHD/System/Library/Extensions
MacintoshHD/Library/Extensions
I have done the go to folder and trashed those files and emptied the trash, a couple of times with Apple Support Tech guiding me. Some recovery and reinstalling and nothing seems to help. I am still without internet. I too spent 3 1/2 hours with Apple Support last night. So frustrated ...but I see I am not alone. I am on late 2009 iMac Desktop and tried to install OS High Sierra on Wednesday....now no internet.
it worked! thank you so much. I was crawling around everywhere for hours looking for what might have happened.
Worked for me with the addition of deleting the kext files.
Thank you Dawn! I found the NetNanny kext file and deleted it and lo and behold everything started working again. I spent well over an hour with Apple Support and no luck solving the issue. They told me I had to take my computer in to the Apple Store to fix it. You saved me a lot of hassle. Thanks again!
Thank you! Worked like a charm. Thanks
Thanks for the advice about the Kext file. I had a netnanny kext file. After I deleted it everything went back to normal.
It worked for me on a early 2015 MBA with Intego virus barrier.
This solution did not work for me, but deleting a kext file from some old internet protection software (in my case NetNanney) that was imported from my previous MAC did. From Finder, select Go, and type in Library/Extensions. You will see kext files there. If you don't want to delete the file(s), another user said moving the file(s) to EFI/Clover/Kexts/Other worked for them. I cannot verify this as I simply trashed mine. Hope this helps someone out!
Awesome fix! Thank you
It worked for me like a charm. Thanks!
initially after upgrading it worked fine for a few days and then all of a sudden my network (ethernet and WiFi was lost. But it is back now.
Thanks again.
Pieter
Above procedure does not work...
Who can help please to solve this nasty issue?
Antoon