Fix Wi-Fi macOS Big Sur/Mojave/Catalina issues on MacBook Air/MacBook Pro & Speed Up Slow WiFi

Last Updated on Jul 15, 2020

So finally, macOS Mojave is installed on your Mac, hope so you are enjoying Mojave except when you encounter any bug. One bug can make your world upside down, which is Wi-Fi not working on macOS Mojave/macOS Catalina or Wi-Fi issues on macOS Mojave/macOS Catalina. When I updated my macOS to Mojave, in my mac when I put my mac on sleep mode and when I wake mac, macOS Mojave drops Wi-Fi connections.

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Although the speed of the Wi-Fi connection decreased suddenly, Wi-Fi connectivity issues on macOS Mojave/macOS Catalina, etc. are the common issues that are reported by users. If you’re one of them and want to fix Wi-Fi macOS Mojave issues, then read this article and try to fix Wi-Fi issues on macOS Mojave or later.

One of our readers “Bernd” noticed and give positive feedback, after implement [Fix 2] changed the DNS to the Google ones he got huge success in stability and speed as well.

Fix Wi-Fi macOS Big Sur/Catalina/Mojave Problems: Free Tips and Tricks

Quick Tips

  • Connect your mac with different Wi-Fi connections, and mac works perfectly then there might be an issue with your router.
  • Wi-Fi drops during sleep/wake? As I said before some of them reported mac is dropping Wi-Fi during sleep or wake and sometimes it takes more time to re-join Wi-Fi. Try these steps.
    • Step 1: From the “Wi-Fi” menu turn off Wi-Fi.
      Step 2: After few minutes turn on the Wi-Fi and connect to your macOS Mojave.
  • Try to connect another device to your Wi-Fi.
  • Switch Wi-Fi channel from 5GHz to 2.4GHz or vice versa.

Solution 1: Update your macOS

Before implementing any hard solution to fix Wi-Fi macOS Mojave issues, check if any update available for macOS and if you find an update then update your macOS Mojave to the newest version. Please take a backup if you are updating mac.

Mac Catalina or Later: Apple logo > About This Mac > Software Update.

MacOS Mojave or Earlier:

Step 1: Launch the “App Store”.
Step 2: In the “Update” section check for updates and download and install.

Solution 2: Contact Network Service Provider

Did you contact the network service provider? If not, then it should be your first step towards troubleshooting the Mac Wi-Fi issues. Sometimes, the broadband provider goes under maintenance, without informing their customers and so this type of problem arises.

Therefore, directly make a call to the Support Team of your respective network provider and ask them. If they confirm, everything is running perfectly from their side, its time for you to be in action and fix Mac wifi not working Big Sir/Catalina.

Solution 3: Stay Close to Wi-Fi Router

When Mac Wi-Fi not working but connected and showing poor signal, make sure you are close to the Wi-Fi router or modem, whatever. For better speed and performance, we need to keep the Mac near as much as possible.

Long-distance between the device and router can also result in network connection/disconnection frequently.

Solution 4: Forgot the Wi-Fi Network & Reconnect/Check Network Name

Wi-Fi won’t connect on Mac if your Mac is battling with two same name connections. For say, I’m connecting Mac to my home’s Wi-Fi network named, ‘Private Network’, and on the other note I’ve renamed my office’s Wi-Fi network, ‘Private Network’, under such cases, you’ll definitely face issues.

Even though the network names are different you should Forget the Wi-Fi Network and reconnect by entering the password.

  1. Click on the Apple logo on the top menu bar.
  2. Select System Preferences.
  3. Find Network and open it.
  4. Choose Wi-Fi from the sidebar.
  5. Click Advanced and then select the Wi-Fi network.
  6. Lastly, click on (-) to remove it.

After doing this, I’d recommend you to restart the Mac before reconnecting to the Wi-Fi network. Jump to the next section.

Solution 5: Restart Mac and Wi-Fi Modem

Up next is to reboot the Mac and Wi-Fi router to rule out the problems that lies between them. Press the power button on the Mac and after a while boot it. Similarly, unplug the power adapter of the Wi-Fi router and plug it back.

Solution 6: Create a new custom network location

Step 1: Open “System Preferences”, from the Apple Menu.
Step 2: Open “Network” and then select “Wi-Fi”.
Step 3: Now, on the top, you will find “Location” panel, drop down and select “Edit Locations”.
Step 4: Next, Tap on “(+)” sign and give some identifiable name which suits you. Then tap “Done”.
Step 5: Pull down the “Network Name” panel and select the Wi-Fi network to join.
Step 6: Tap “Advanced” button.
Step 7: Now click on “TCP/IP” and then click on “Renew DHCP Lease”.
Step 8: Now tap on “DNS” panel and then click on “(+)” symbol and enter “8.8.8.8” and “8.8.4.4”.
Step 9: Then, open “Hardware” panel and set “Configure” to “Manually”.
Step 10: And “MTU” to “Custom” and enter “1453” below in section.
Step 11: Tap “OK” to end this.
Step 12: To save all the changes you have made to tap “Apply”.
Step 13: Close this window.
Step 14: Now, launch “Safari” and check if it is working or not.

If still Wi-Fi issues on Mojave isn’t fixed?

Solution 7: Create new Wi-Fi configuration in macOS Mojave

Before implementing this fix back up your mac, these steps involve system-level changes. So if things go south, then you will not lose your data.

Step 1: From the upper right corner, drop-down “Wi-Fi” menu and turn off.
Step 2: Now, create a new folder on the main screen, or even you can use the existing folder and name it “Wi-FiConfigBackup”.
Step 3: From the “Finder”, expand “Go” menu and then select “Go To Folder”.
Step 4:/Library/Preferences/SystemConfiguration/”, enter this code into the window and tap “Go”.
Step 5: Search and select all these files.

com.apple.airport.preference.plist
com.apple.network.eapolclient.configuration.plist
com.apple.Wi-Fi.message-tracker.plist
NetworkInterface.plist
Preferences.plist

Step 6: Open the “Wi-FiConfigBackup”, and drag the above selected into the folder.
Step 7: Now, reboot the mac.
Step 8: After mac restarts connect the Wi-Fi as usual.

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Solution 8: Use Mac in Safe Mode

Still can’t connect Mac Big Sur to Wi-Fi? Then try rebooting Mac in Safe Mode.

  1. Shut down the Mac.
  2. Power On the Mac and at the same time hold the Shift key until the login window appears.
  3. Enter the login credentials.
  4. The Mac will restart in Safe Mode.
  5. You can exit Safe Mode by a simple restart.

Solution 9: Reset PRAM/NVRAM

So far reset PRAM/NVRAM worked greatly. Let’s see if it fixes your issue or not.

  1. Turn off the Mac.
  2. Turn On the Mac and immediately hold down the Command+Option+P+R for almost 20 seconds.
  3. If your Mac chimes while boot, then release the keys after you hear the second chime.

Jaysukh Patel is the founder of howtoisolve. Also self Professional Developer, Techno lover mainly for iPhone, iPad, iPod Touch and iOS, Jaysukh is one of responsible person in his family. Contact On: [email protected] [OR] [email protected]

2 Comments
  1. Wow, I changed the DNS to the Google ones – was set to the IP of my router [which had the Google DNS] – and also adapted the MTU.
    Blazing fast, sites load in an instant now.
    THANK YOU SO MUCH!

  2. Thanks fix 2 worked….super.

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