DNS - Conditional Forwarders error

Hi I am trying to create a conditional forwarder in my domain to a different domain and I am getting an error that states " The server with this IP address is not authoritative  for the required zone"

I have ensured that I can ping to the remote domain that I am trying to apply the conditional forwarder and I can confirm that the Nameserver tab on the remote DNS has the IP addresses of the DNS servers that need to be used as the conditional forwarders IP addresses.

Any assistance would be appreciated.
OZSGGeneral Manager Technical ServicesAsked:
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mbkitmgrCommented:
In saying domain do you mean Microsoft DNS domain or Public domain.

The message is describing the issue, hence my question
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OZSGGeneral Manager Technical ServicesAuthor Commented:
HI mbkitmgr both domains are internal Microsoft DNS domains
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mbkitmgrCommented:
And are you connecting via the internet or VPN over internet
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OZSGGeneral Manager Technical ServicesAuthor Commented:
I am connecting these two domains via an IPSEC tunnel over the INternet
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8046586Commented:
Just for a test purpose, can you set up manually on your PC as a primary DNS the server from the remote end, flush the PC DNS and check if you can browse on the internet. Just to test that packages will travel over IPSEC without issues.
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mbkitmgrCommented:
Is UDP being allowed thru your tunnel and port 53 I should have asked
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OZSGGeneral Manager Technical ServicesAuthor Commented:
Hi guys

Sorry for the late response , it would appear that the forwarder was not working at all and I ended up setting up a secondary zone for the other domain, this is working fine and met the criteria to setup a domain trust which I was after. Checked all the firewall settings even telnet checks for the ports looked ok.
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OZSGGeneral Manager Technical ServicesAuthor Commented:
A workaround was used to setup a secondary zone instead of a conditional forwarder to get to the goal of setting up a forest trust.
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