MacBook Pro Dropped WiFi and won’t reconnect

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MacBook Pro Dropped WiFi and won’t reconnect

I have a relatively new MacBook Pro (less than a year old). Recently my home WiFi signal dropped and now my MacBook Pro won’t reconnect. All other devices in the house connect just fine but the MacBook insists that the password is incorrect (even when I share the password from another device that is already connected). I have tried rebooting the computer, I have run diagnostics, and I have rebooted the router. We tried using another MacBook and it initially connected, but then the same thing happened. The signal dropped and now the MacBook insists that the password is incorrect. So it appears that it’s only an issue with the MacBooks but all of the iPhones and iPads are connecting just fine. The MacBooks connect to my iPhone hotspot just fine. They just won’t connect to our home WiFi network. PLEASE HELP!

Posted on Aug 5, 2018 10:08 AM

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Answer 1

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Tesserax

Level 10

158,658 points

Aug 5, 2018 11:00 AM in response to Fssax

Start here:

Check for Wi-Fi issues using your Mac - Apple Support
macOS Sierra: Use Wireless Diagnostics - Apple Support

If neither of the above articles help, try the following on your Mac in order, until (hopefully) resolved:

Create a New User Account
System Preferences > Accounts

Click "+" to add a new account.

Log off, and then, log back on with the new user account.

Try connecting to a Wi-Fi network with your Mac's AirPort.

If this resolves the problem, there may be something amiss with your current profile and will require further troubleshooting.

If this does not resolve the problem, go ahead and log back into your normal account and go on to the next step.
Delete AirPort Keychain Entries
Launch the "Keychain Access" application, located in Applications/Utilities.

In the left-side window, select "login" under Keychains and "Passwords" under Category.

Click on the "Kind" filter at the top and look for any "AirPort network password" entries...and delete them.

Close Keychain Access.
Delete & Add Back Preferred Network(s)
System Preferences > Network > Wi-Fi > Advanced > Wi-Fi tab

Delete all entries under "Preferred Networks."

Click on OK.

System Preferences > Network > Wi-Fi > Advanced > Wi-Fi tab

Add the preferred network(s) using the "+" button.

Click on OK.

Restart or log out, and then, back in.
- If it works, then you are done.
If not, go on to the next step.
Move System Configuration Files
Quit any applications that are currently using Wi-Fi.

Turn off Wi-Fi from the Wi-Fi icon on the macOS menu bar.

Open Finder > Go > Go To Folder
- In the "Go to the folder" window, enter:/Library/Preferences/SystemConfiguration/
- Locate and select the following files:
  Note: Files are macOS version specific, not all the following files are used in each version.
  com.apple.airport.preferences.plist
com.apple.network.eapolclient.configuration.plist
com.apple.wifi.message-tracer.plist

NetworkInterfaces.plist
preferences.plist

Move any matching files to the macOS Desktop. You can place them all in a folder as a backup. The "missing" files will be rebuilt after restarting the Mac.

Reboot the Mac.

Re-enable Wi-Fi from the Wi-Fi icon on the macOS menu bar.

.

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