I have a MacBook Pro (Retina, 15-inch, Mid 2014) running on MacOS 10.14.3 (18D42) and since some time I have been unable to connect to any 5GHz WiFi networks while 2.4GHz networks from the same routers are ok.
I have tried several things to no avail:
- deleting the network in my wifi settings
- using three separate and different brand routers
- resetting SMC and NVRAM
- deleting settings in /Library/Preferences/SystemConfiguration/ directory
- made the 5GHz open without passwords
- Changed SSID names
The Macbook is able to see the network; however, when I try joining the network, and I enter the password I keep getting an error "the wi-fi network requires a WPA2 password".
Interestingly, I get the same error when the authentication method is set to "Open".
I am 100% sure that the password is correct as I've tried several times (also setting up the 5GHz on different routers). The networks are working (e.g. from my iPhone, Android phones).