Conditional forwarder domain name length

I'm trying to create a Conditional Forwarders from Windows Server 2008 DNS to another domain Windows 2003  DNS, but I'm getting error: The server with this IP address is not authoritative for the required zone & when I apply it I get this error: A problem occurred while trying to add the conditional forwarder. A zone configuration problem accrued.

Is there a limit for the DNS Domain name?

The Domain Name I'm using is: abcdef_abcde.ab.abcdefgh.ab.ab
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ManzourAsked:
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Cliff GaliherConnect With a Mentor Commented:
Sounds like a direct conflict between an existing zone name and the conditional forwarder you are trying to create. This can occur if split-brain DNS was implemented previous to the decision to use conditional forwarders.
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Cliff GaliherCommented:
Underscores in DNS zones are bad. Don't use them.
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ManzourAuthor Commented:
Yeah...I know. It's already exist! What should I do?
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Cliff GaliherCommented:
Probably nothing you can do if you don't control the actual problematic domain. Underscores are not in the DNS RFC, so windows isn't the only one that will have issues with underscores.

If you do control the offending domain, plan a migration ASAP.
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ManzourAuthor Commented:
It seems I was able to add now up to: abcdef_abcde.ab.abcdefgh.ab.a   !!!
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ManzourAuthor Commented:
It's so wired!!! The domain ends by .us

It does not like .us !!! I can do .u  or .uss...etc but cannot do .US

 Pleas explain!
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DrDave242Commented:
Do you already have a zone in your environment that would be considered a parent of the zone in your conditional forwarder? For example, if you're trying to create a conditional forwarder named abcdef_abcde.ab.abcdefgh.ab.ab as stated in your original question, you'll get that error if the DNS server already contains a zone with any of the following names:

abcdef_abcde.ab.abcdefgh.ab.ab
ab.abcdefgh.ab.ab
abcdefgh.ab.ab
ab.ab
ab
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ManzourAuthor Commented:
That's correct, DrDave. I have this  zone: ab.abcdefgh.ab.ab.

So, what we should do?

Which one is better: Conditional Forwarder or create new zone under Forward Lookup Zones as a Secondary zone?
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DrDave242Commented:
Since you've got the parent zone in your environment, you can use a delegation for the child zone.
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ManzourAuthor Commented:
I meant in general! We have multiple forests and domains and the DNS and each environment has its own DNS (Mostly AD Integrated)  .
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DrDave242Connect With a Mentor Commented:
In general, you can use a delegation or stub zone in this situation, but a conditional forwarder won't work if the parent zone already exists on the DNS server.
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