Windows Server 2016 – Error EapHost when connecting to NPS from Cisco Access Point


This Content is from ServerFault. Question asked by Delpux

I have a simple setup: Cisco Access Point (old one AIR-CAP3502I-E-K9), and it is connected to an older Cisco Switch, and to the switch, the same VLAN, I have a Windows 2016 server.

The server has RADIUS, NPS, to authenticate clients connecting to the AP.

When I connect with password and username to the WEP-Enterprise I get the following on the AP:

Associated KEY_MGMT[WPA]
#Then the connection fails for the client and this comes
Deauthenticating station xxxx.xxxx.xxxx Reason: Sending station has left the BSS

I check the Event Viewer on the Windows Server and I see I get an application error for EapHost:

Eap method DLL path name validation failed. Error: typeId = 254, authorId=311, vendorId=14122, vendorType= 1

So I go to Register Editor and to HKEY_LOCAL_MACHINESYSTEMCurrentControlSetservicesEapHostMethods311254141221

There I find one .dll file:
WcnEapPeerProxy.dll that should be in the System32 folder. But when I search the System32 directory there is non to be found (as it says in the EapHost error message).

I am very new to all this and am playing with a lab setup, I am wondering if this might be the reason for me not getting a connection, rather than some configuration settings in my NPS?


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