DCDIAG reports broken delegations but not having any DNS issues.

Question

I am planning on moving my 2003 domain to a 2012 domain, I need to resolve all the dns issues with my current domain. When i run DCDIAG i get the following error for all of my name servers. I have 3 seperate forests. I use forwarders to forward to all my
dns servers. I have no DNS issues as far as i know. When i run dcdiag on any of my DC's i get the following error for everyone of my Name Servers.
DNS server: 20.26.212.204 (server.mydomain.com.)
4 test failures on this DNS server
This is a valid DNS server
Name resolution is funtional. _ldap._tcp SRV record for the forest root domain is registered
Delegation is broken for the domain mydomain.com.mydomain.com. on the DNS server x.x.x.x
[Error details: 9003 (Type: Win32 - Description: DNS name does not exist.)]
The only zones in my dns are the _msdcs.mydomain.com and mydomain.com. I do not understand why it is saying mydomain.com.mydomain.com in the error. I am not sure where else to look to try and resolve this error.
Any help greatly appreciated.
Thanks for your help

Answer 1

Hi,
Base on my experience, that must be the Delegated zone issue, this issue is because the new DNS
 has duplicated the name for parent and child domain, you can try to backup your current DNS then delete the duplicate zone then restart the DNS service.
More information:
Back up a Zone File
http://technet.microsoft.com/en-us/library/ee649198(v=ws.10).aspx
Understanding Zone Delegation
http://technet.microsoft.com/en-gb/library/cc771640.aspx
Create a delegation for a domain controller
http://technet.microsoft.com/en-us/library/cc757375(v=ws.10).aspx
Hope this helps.
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