Windows 10 Can't connect to WiFi after Windows 10 May 2020 update (v.2004) - WPA-invalid-2/4-key-msg

  • Thread starter Thread starter Vorsoth100
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Vorsoth100

After our laptops update to Windows 10 v2004, they will no longer connect to our WPA2-Enterprise FortiAP WiFi network. We have troubleshooted and checked our RADIUS/NPS settings, and they are correct. The users get authenticated, but the connection fails with this message in the FortiGate Logs:

WPA-invalid-2/4-key-msg
Probably wrong password entered, invalid MIC in 2/4 message of 4-way handshake from client


The laptop's event logs report "
Dynamic Key exchange did not succeed withing configured time"

Other laptops still on Windows 10 1909 can connect just fine. And if we roll back the Windows 10 update to 1909, it will connect again. If we take the laptop to our other office with Aruba AP's they connect just fine. So it's something to do with the Windows 10 2004 update and the FortiAP 221E Access Points. We just can't figure out how to fix it.

Any ideas or suggestions would be greatly appreciated! Thanks!


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