DNS Forwarding and Delegation Test failed on newly configured 2012 R2 domain controllers ?

What does DNS delegation means ?

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DNS Options
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A delegation for this DNS server cannot be created because the authoritative parent zone cannot be found or it does not run Windows DNS server. If you are integrating with an existing DNS infrastructure, you should manually create a delegation to this DNS server in the parent zone to ensure reliable name resolution from outside the domain "MyDomain.com.au". Otherwise, no action is required.
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OK  
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That was the error when I setup the server as DNS server this morning.

Mahesh,

Yes, I have listed and entered 8.8.8.8 as one of the forwarders. It works on the old server, while on the new servers it doesn't work.

From the new server when Telnet to 8.8.8.8 53 - in Putty, I selected Telnet and then Port# 53:

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PuTTY Fatal Error
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Network error: Connection refused
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OK   
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Select all Open in new window

While on the old server, I can keep the Putty window open when Telnet to 8.8.8.8 on Port 53 using Putty.

Mahesh,

I'm just adding 2x new DC in the same AD site (single AD domain).

The static IP address on the new server that doesn't work:
PRODDC11-VM
DNS1: 10.0.0.11 (itself)
DNS2: 10.0.0.12 (another new DC on the same AD subnet)

PRODDC12-VM
DNS1: 10.0.0.12 (itself)
DNS2: 10.0.0.11 (another new DC on the same AD subnet)

The static IP address on the old server that works:
PRODDC01-VM
DNS1: 10.1.1.26 (another DNS server in the different AD site/Data Center)
DNS2: 127.0.0.1 (local loopback)

PRODDC02-VM
DNS1: 10.1.1.26 (another DNS server in the different AD site/Data Center)
DNS2: 10.1.1.25 (another DNS server in the different AD site/Data Center)

No I cannot perform connection using Putty from the new server to 8.8.8.8 port 53. But from the old server it is possible using Putty. Does this means the DNS TCP/53 is blocked by the hardware firewall ?

Mahesh,

So in this case, i will ask the network team to open the TCP/53 for this new DomainController servers.

Also what about _msdcs delegated folder under domain.com zone on new DCs?

Mahesh, I can see the new servers is already have it's own NS record in there.

yes, there are some missing or decommissioned server with the NS records still there.

Mahesh,

I've created another thread here: https://www.experts-exchange.com/questions/29012705/DNS-server-TEST-Delegations-Del-FAILED-IP-Unavailable-Missing-glue-A-record.html

I can see there is PRODDC26-VM.MyDomain.com (NS) record entry under the MyDomain.com (greyed out folder). Not sure what this is for, but the server PRODDC26-VM.MyDomain.com still exist and running as Domain Controller in the other AD site.

Shall I delete it ?