Domain Trusts & DNS Conditional Forwarding

Hi Experts,

I hope you can help me with an issue we are having.

We are attempting to setup a domain trust between two domains. I have set up conditional forwarding for both domains, which validate successfully

However the domain trust only validates at Domain B's end. Domain A fails every time

Domain A has two AD servers, one in one office, the other in another and local to domain B

Upon further investigate i found that the AD server for domain A that is local to B can resolve DNS queries, but the other cannot.

Since the other is the primary and holds most of the roles, i believe this is why validation fails at domain A's end

I've checked the firewalls at both sites but i cant see anything being blocked and i can even  ping the server ips
Graham HirstIT EngineerAsked:
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Smith and AndersenCommented:
Did your dns zones replicate properly to both domain dns??
If you dont have a zone for domain B in domain A and vice versa it will fail

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Graham HirstIT EngineerAuthor Commented:
Looks like that might have been the issue. I checked DNS and the conditional zone was present on both servers, but it wouldn't work. Yet this morning both servers can access the other domain and the trust is fine
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