Один контроллер домена 2008 R2 не может найти себя

У меня есть стандартный сервер 2008 R2, который выступает в качестве контроллера домена и установлен Exchange 2010. В этой среде нет других серверов.

I'm having some problems with the exchange services starting and, on investigation, can see that it is because the server seems unable to find itself as a domain controller.

I've ensured that the NIC has its DNS set to the internal IP of the server. I've also checked that DNS services are started, and indeed they are.

I've run DCDIAG and here are the results...

I was thinking this feels like a DNS issue, and sure enough, right there in the event log...

NSLookup is giving the following...

The error given on exchange services is...

 The Microsoft Exchange Active Directory Topology service on server localhost did not return any suitable domain controllers.

not sure where to go from here.

Кто-нибудь сталкивался с этим раньше?