How do I get replication to work from Servers on different domains and subnets.

I have a HyperV host on one Domain of techno.local and another on a domain of The is on IP scheme and the techno.local server is on Both are on the same physical network. HOWEVER the is actually on a Domain that has its DNS Servers on another subnet across a VPN. That IP scheme is I was able to join the server on the network to the domain at with the proper credentials and the DNS pointed to the DNS Server of But now I am trying to setup HyperV replication from the 10.2 and 20.40 machines on different domains and they can't see each other. How can I get around that?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Cliff GaliherCommented:
If they are on the same logical subnet them they should "see" each other, but you'll have to use certificate based authentication and configure DNS records appropriately. If they are on different subnets, it won't matter that they are on the same physical or layer-2 network. You'll need to configure routing between the subnets. And the above about certificates and DNS still applies.
aandoAuthor Commented:
I was able to create conditional forwarders and allow them to ping each other. But when I go to use Kerberos Authentication it says "The specified target is unknown or unreachable." I know it is reachable so it must be an authentication issue. Can it be resolved without certificates if I use Kerberos?
Cliff GaliherCommented:
Kerberos requires both machines be in the same domain. So given your description, no. Hence my strategy that you'll need to use certificates.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.