External DNS server not replicating records to secondary after migration from 2003 to 2012

Hi
I have a query relating to 2012 Server and DNS.
Last week we de-commissioned our primary external DNS server (Windows 2003 Server) and moved the role over to a new Windows 2012 server.
Since this point replication to our secondary server (3rd party hosted) does not seem to occur and our DNS records seem to have expired on the secondary server as we cannot look these up via nslookup.
I cannot see any failures in the event log of the server; I have checked our external firewall logs and nothing is being blocked inbound/ outbound as far as I can see. And the server’s local firewall has been disabled.
The server is a standalone server in a workgroup with a standard filebased primary zone, with no AD integration and recursion disabled.
When I created the zone I copied the .dns file from the old server and selected this in the interface during the creation of the zone on the new server.  The new server has the same internal and external IP as the old server and the old server is off-line.
I have also manually increased the serial number of the zone and still no joy.
One thing that I have noticed is when I open the zones properties/Name Servers and click edit on the external nameserver I get the infamous "The server with this IP address is not authoritative for the required zone" error.
Any help Would be appreciated, thanks in advance

Nice to hear that you are close in finding the problem. So in short:
You have enabled Zone transfers in DNS management console for the applicable zone
You have verified that your DNS is listening to the correct interfaces
You have enabled firewall rules to accept TCP and UDP traffic to port 53
You have checked if "BIND secondaries" option is applicable to your case
You have initiated a zone transfer from the secondary server
Lefteris Karafilis 
MCSE, MCTS, SEC+ 
LinkedIn: http://www.linkedin.com/in/lkarafilis 
Mail: [email protected] 
Blog: http://www.karafilis.net 

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