Microsoft NPS Error Wrong Domain (ID 4402) appearing in our logs. What is causing this?
This error indicates that a domain controller can’t be found for an authentication request from one of your RADIUS clients. You are receiving a request, which you aren’t forwarding to the NRPS, but there’s no domain controller available to handle the request. To investigate further you need more details about the error instances, i.e. for which domain a controller cannot be found. Microsoft TechNet article on this: There is no domain controller available for domain.
