We just installed two new C5210 controllers for a client. They also currently have two C4110-1 controllers in production. One of the new controllers that was installed is not authenticating via Radius with a Windows 2012 NPS server. The logs on the NPS server show a successfull authentication, however the wireless controller shows an error. When I test the radius server from the WLAN auth section I receive the following error: RADIUS_SHAREDSECRETKEY_DECODE_FAILED
The authentication request does show in the NPS logs with an incorrect user account/password error. So the controller is sending radius requests to the server successfully. If I test the radius server from the Login Maintenance screen using authorized credentials the test returns a "System error" message, while the NPS server shows an authentication success message.
I have removed the WLAN controller as a radius client and then added it back. I have also deleted the radius server from the controller and added it back. The shared secret is entered correctly and it is sending the authentication requests to the radius server correctly, it just doesn't seem that it is receiving a proper response back.
The other new controller is authentication properly as well as the two existing controllers. It is only one controller that is experiencing this issue.