Register DNS not working

Hi, I have 2 virtual machines in a vnet in Azure. 1 is Server 2012 r2 from the marketplace and 1  build locally in Hyper-V and uploaded converted to disk etc. The 1st machine from the marketplace will issue a DNS update via ipconfig /registerdns ok with no errors at all. The second one does not and throw event 8018 to the system event log:

The system failed to register host (A or AAAA) resource records (RRs) for network adapter
with settings:

           Adapter Name : {5D7C09A2-CF46-498C-8E19-8E486C4698B5}
           Host Name : SVWAZUDC01
           Primary Domain Suffix : <removed this text>
           DNS server list :
              192.168.0.15, 192.168.0.16
           Sent update to server : <?>
           IP Address(es) :
             10.10.0.4

From what I can see the 2 machines are identical. I've tried all the usual such as checking the 'register this connections address in dns' in the network interface properties.

Any ideas?

Cheers

Chris

---

Chris Holland