Windows 2012 R2 NPS/RADIUS Server. Event ID 4402: There is no domain controller available for the domain.

35 pts.
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Domain Controller
Windows Server 2012 R2
Attempting to replace existing Windows 2003 RADIUS server with new 2012 R2 NPS/RADIUS Server. RADIUS server used for 2nd Factor SafeWord authentication. All policies and settings replicated to new NPS server. NPS server has been registered w/ AD (child.domain.com). When testing w/ NTRadPing Utility, continually get response: Access-Reject. Event ID 4402 "There is no domain controller for the domain domain.com" logged in System Log on NPS server.
Unable to locate any reference to issue w/ child domains. Not sure if this error is perhaps a red herring of some sort.
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Checking further, it appears this issue is a result of the customer having a NetBIOS domain name (pre-Windows 2000) that includes a “.” (.com).

Microsoft reportedly dropped support for this in NPS with the release of Server 2008 R2.
Contrary to what others have said, you do not need to rename your domain or back rev to 2008 non-R2.
I was able to resolve this issue by adding a reg key to force authentication to use the DNS name, instead of the NetBIOS name.
(See: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/Q_27851388.html)

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