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Raspberry Pi Zero Not Connecting to Unifi AP

I recently had a lot of trouble getting my Raspberry Pi Zero W 2 to connect to WiFi on my Ubiquiti Unifi AP AC Lite after a firmware upgrade to 5.43.46. It’s a 2.4Ghz-only device, and actually all of my 2.4Ghz-only devices wouldn’t connect.

Apparently something I did set a setting called PMF (Protected Management Frames) to “Required”, and the Pi Zero W 2 doesn’t support that. In theory, this setting should help prevent clients from getting disconnected through de-auth packets from an attacker. However, not all devices support this.

To fix the issue, you need to find the PMF setting under Settings -> Wifi -> <your network> -> Advanced -> Security and change it to “Optional”.