Radius request to Active Directory Domain Controller running Network Policy Server suddenly stopped working

[Mattias_Anderss]

We have a V2110 Controller set up to do authentication with RADIUS to our AD server using MSCHAP v2. But it suddenly stopped working.
In the log on the AD server I can see this many times in application log:
Negotiation failed. No available eap methods.
It never appeared before it was working and now it's showing that error a few times every minute.
I tried duplicating the Network Policy, disabling the old one and renaming the new one to the old ones name. But no luck.
Anyone else bump in to this?

[Ronald_Dvorak]

Correct...
https://gtacknowledge.extremenetworks.com/articles/Q_A/Does-the-test-button-on-the-802-1x-authentica...

[Doug]

That would do it... Take a look at https://technet.microsoft.com/library/cc771696.aspx for more info and assistance.

[Mattias_Anderss]

Ah, when I hit edit on that I just get:
Cannot configure EAP
A certificate could not be found that can be used with this Extensible Authentication Protocol.

[Doug]

Basic PEAP setup without any Filter-ID return...

[Mattias_Anderss]

Yes, it is set to NAS Port Type with the value Wireless - Other OR Wireless - IEEEE 802.11.