Ran a dcdiag /c /f:dcdiag.log and received the following warnings.
TEST: Delegations (Del)
Warning: DNS server: dc1.sub.mydomain.corp. IP: <Unavailable> Failure:Missing glue A record
Warning: DNS server: dc2.sub.mydomain.corp. IP: <Unavailable> Failure:Missing glue A record
Warning: DNS server: dc4.sub.mydomain.corp. IP: <Unavailable> Failure:Missing glue A record
Warning: DNS server: exdc1.sub.mydomain.corp. IP: <Unavailable> Failure:Missing glue A record
sc.mydomain.corp is my root domain controller
dc1, dc2,dc4, exdc1.sub.mydomain.corp are DCs in a subdomain.
I verified that each DC can resolve each other.
I ran dnslint /ad /s localhost and it stated there were no glue records missing
Ran the same dcdiag command on the other root DC and got the same errors. Ran the same dcdiag command on the DCs it stated were missing glue A records and it returned no errors
I see in TechNet, that error means The configured delegation is missing glue A record. It does not state how this occurs or how to resolve it. (http://technet.microsoft.com/en-us/library/cc776854.aspx
Curious what else I could check that could be causing these errors, or warnings. Have seen other posts here about a DC that had been deleted. This is not the case as all these DCs are active.