WLAN Authentication problem

I'm trying to get my wireless clients to authenicate with my RADIUS-server via EAP, but i get this error all the time:

Authentication Details:
      Proxy Policy Name:            Use Windows authentication for all users
      Network Policy Name:            -
      Authentication Provider:            Windows
      Authentication Server:            server.domain.local
      Authentication Type:            EAP
      EAP Type:                  -
      Account Session Identifier:            -
      Reason Code:                  1
      Reason:                        An internal error occurred. Check the system event log for additional information.

AP Controller Cisco 520 synchronizes with Windows 2008 NPS. I use the standard connection request policy with P-EAP and certificate, and a network policy with the same certificate.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Where is this error generated from?

What is in your system event log?
ReubenwelshAuthor Commented:
The customer decided to cancel the project and use the hardware at there sister company so this can be closed

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
no real help?
I was waiting for a response from you. Bit of a poor excuse.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Wireless Networking

From novice to tech pro — start learning today.