When Server 2016 DNS Server has a delgation within a primary zone, CNAME records in that delegation result in queries to the delgation's name servers, not forwarders / root hints.
For example:

Primary zone: one.example
Delegation: foo.one.example, with nameserver ns.bar.com

In that delegated zone, there exists a record:

baz.foo.one.example IN CNAME other.two.example

two.example's zone, hosted by ns.somethingelse.com, has a record:
other.two.example IN A 1.2.3.4

From a client pointed at the DNS server, query baz.foo.one.example.

I would expect the server to query ns.bar.com for baz, receive a reply of other.two.example, and then query either two.example's nameserver, or use the default forwarders to do the same, resulting in a recursive resolution passed back to the client of 1.2.3.4.

What actually happens, in Server 2016, is that only the CNAME is returned. With debug logging enabled, the DNS server issues a query to ns.bar.com for other.two.example, and of course gets a REFUSED response.

In Server 2012 R2, with the same configuration, baz.foo.one.example is resolved recursively to 1.2.3.4.

I'm pretty sure the new behaviour is incorrect?

Thanks,
Rob

Writing a script to provision a machine - we first remove the IPAddress (and any default gateway), But sometimes there is no address. That;s fine - we just try/catch and move on, liike this:

Try {

Remove-NetIPAddress -InterfaceIndex $IfIndex `

                    -AddressFamily IPv4 `

                    -Confirm $false

}

Catch {Write-Verbose 'No IPAddresses found'}

But instead of the nice write-verbose message, we get a fatal error:
Remove-NetIPAddress : No matching MSFTNetIPAddress objects found by CIM query for instances of the ROOT/StandardCimv2/MSFTNetIPAddress class on the CIM server:
SELECT * FROM MSFT_NetIPAddress WHERE ((IPAddress LIKE 'False')) AND ((InterfaceIndex = 3)) AND ((AddressFamily = 2)). Verify query parameters and retry.
At line:3 char:5
+ Remove-NetIPAddress -InterfaceIndex $IfIndex `
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+ CategoryInfo          : ObjectNotFound: (MSFT_NetIPAddress:String) [Remove-NetIPAddress], CimJobException

+ FullyQualifiedErrorId : CmdletizationQuery_NotFound,Remove-NetIPAddress

Please fix this cmdlet so it's trapping can be caught with a catch block.