No internet connectivity after installing Mojave

I solved the problem by doing a clean install of Mojave, and once the installation was finished I used Migration Assistant to migrate my applications, my settings, and my user folder—but NOT the “other files and folders”. Once I restarted, the problem was fixed. This solved both the internet problem and the slow login.

Start by seeing if the following article can help:

Check for Wi-Fi issues using your Mac - Apple Support

If not, try starting up your Mac in Safe Mode and see if you can get wireless connectivity in that fashion.

I had the exact same problems: slow response, no internet, etc. I solved the problem by doing a clean install of Mojave, and once the installation was finished I used Migration Assistant to migrate my applications, my settings, and my user folder—but NOT the “other files and folders”. Once I restarted, the problem was fixed. The problem is obviously a software conflict and not a problem with Mojave. The solution is just to get rid of some of the garbage left from too many updates without getting rid of old software.

I have MacBook Air-13 Early 2014 model. I did update to Mojave on Oct 22. After several days my Mac lost Internet connection. It was really frustrating with no connections to outside.

Fortunately I had TM backup before my update. I restored my Mac to previous OS High Sierra as first step. Then I repeated update to Mojave again. This time before rebooting, I stoped the update process (force to kill the update process from Apple icon->Force Quit).

This time I followed advice from this article to make a bootable OS USB(http://osxdaily.com/2018/09/26/make-macos-mojave-boot-usb-installer/). Actually I think this step may not required. It is good to make one for emergency or install to other Macs easier.

The next step is to reboot. While it is rebooting, hold cmd+R till you see Apple logo. This will bring up a menu of options. Choose Disk Utility to erase my Mac HD. This will guaranty the installation to a clean Mac.

Create an admin user during installation. When it is done, login to admin and run Migration Assistant. This app provides options to migrate accounts, Applications, and accounts back from TM. Uncheck Computer and Network settings.

With above steps, now my Mac is back all my apps, accounts and documents to a new Mojave. So far so good. I hope this clean installation will be fine.

By the way, I went to local Apple Store to get advice. I explained my strategy to do a clean installation, and they agreed this way. Since the process took very long time, back up to TM again, installation, and migration. I came home to finish the whole process. During this process, I got Apple Support call twice to confirm my restoration fine. Thanks Apple!

This hint helped me - the symtoms were exactly the same. Everything started three months ago when I tried to install first Public Beta - all later versions and final install acted in the same way: No network connection, slooooow.

TL;DR - on the native drive (/Volumes/Macintosh HD), got to /etc/ and rename the sysctl.conf file, reboot and voila!

https://discussions.apple.com/thread/8551730?answerId=33993572022#33993572022

I have reinstalled Mojave. At first, it seems that network is back to normal. However, after one week, it getting slow even no connections.

I did some research. I find out that my System Preferences->Network->Wifi->Advanced->Proxies have one "Socks Proxy" is checked. I uncheck this and applied the change. The network and emails back to normal. I hope this will resolve my network issue.

I had the same problem with my iMac......restarted in Safe Mode, Disk the Disk Utility First Aid after starting with a control R....no help. Then I (for no logical or apparent reason) decided to disable the VPN and BINGO all is well again. Dunno if that software will be updated to be compatible, but hopefully this will help someone else.

Finally found a solution, thanks to this post: Re: Mojave login UI sluggish & laggy

If you're booting from a usb drive, make sure to edit the file on the right volume. My MBP is now back to being healthy and working perfectly on Mojave... with WiFi!

TL;DR - on the native drive (/Volumes/Macintosh HD), got to /etc/ and rename the sysctl.conf file, reboot and voila!

I wouldn't presume to second guess anyone...especially an apple technical advisor, but I had this "NO INTERNET" problem as soon as I updated to Mojave...None, No internet. I was getting a valid connection with other devices on the network and could use email, web browser, etc. without problems on devices that were running MacOS 10.12 or so. The ONLY thing I did that changed this problem was to disable my VPN. With the VPN off....back to normal. Everything worked perfectly. I downloaded and installed the newest version of the VPN software and bingo...back in business. So, for me Mojave is NOT a problem....just a compatibility issue with updating. This is not unusual.

Hi,

The command taught to me by the Apple tech was to hold down the option, command, p and r keys simultaneously while powering on the computer from a total shut-down. Easier if you have someone hit the power button while you hold down the keys. This gets you to the recovery screen with several options including a clean install of Mojave (didn't work for me) and access to your Time Machine back-up. In this mode, the wifi works as does the Time Machine. I'd had enough of OS14 and restored to High Sierra.

Hope this helps. Maybe the clean install of Mojave will work for you.

Best,

A

If you have a VPN, try to disconnecT from that. That worked for me after searching everywhere.

Trying to figure out how to fix my vpn.

What worked for me was to go to System Preferences -> Network -> Location -> Edit and then Add a location (just named mine home). Give it a couple of seconds for the network devices to come back on. That's when I was able to reach the internet.

I could only solve this with a clean install. I then restored my documents from backup. Then I had to clean install all my apps

Hold Option+Command+R as you start the laptop and you should have access to MacOS Utilities.

Edit: WiFi/USB Ethernet adapters will work in recovery mode, they just won't work in the broken upgrade of Mojave.

I experienced the lag and sluggish performanced too. Only things to do is disable VPN or any DNS and adblock apps. Then everything back to normal.

I managed to reinstall the OS on recovery mode, because previously I messed up startup item with Clean My Mac. I assumed the DNS app conflict with updater in background, everytime the Mac login.