To resolve this error, verify RADIUS server settings. To perform this procedure, you must be a member of the Domain Admins ...

To resolve this error, verify RADIUS server settings. To perform this procedure, you must be a member of the Domain Admins group.

To reconfigure, update, or replace the RADIUS server:

. Contact the RADIUS server vendor for configuration assistance. Vendors might provide updates that allow the RADIUS server to send response messages that comply with the RADIUS protocol. 
2. If the vendor cannot provide configuration instructions or updates that allow the RADIUS server to send RADIUS protocol-compliant messages, you must use a RADIUS protocol-compliant RADIUS server with NPS.