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RPC server is unavailable setting up DFS for replication

I have 2 forests (one server in each) connected via WAN and would like to replicate a directory between the two (a quality manual) servers. first domain d1.local second domain d2.local
I have setup dns forwarding on both servers so ping s2.d1.local works from s1. and ping s2.d2.local from s1 also resolves.
I have also set up external trust with domain wide authentication.

I added a dfs root on each server hovever whenever I try to "show" the root of the remote server I am able to browse to the remote domain and the DFS root names appear. However the show root fails with a  "RPC server is unavailable" error.

Is this the best way of achieving automatic replication?
How do I get it to work?
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btomkins
Asked:
btomkins
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1 Solution
 
NJComputerNetworksCommented:
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NJComputerNetworksCommented:
Servers in a replication group must be in the same forest. You cannot enable replication across servers in different forests.   -- http://technet2.microsoft.com/WindowsServer/en/Library/d3afe6ee-3083-4950-a093-8ab748651b761033.mspx?mfr=true
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btomkinsAuthor Commented:
Can I enable FRS replication on a DFS link whose targets are in different domains?

Yes, if you are a member of the Enterprise Admins group, you can configure FRS replication on a DFS link whose targets are in different domains in the same forest. If you are not a member of the Enterprise Admins group, permissions must be configured as follows:

I guess that "same forest" thing is a bit of a killer. I dont wont to join the same forests in fear of getting lost.

Any other suggestions on doing the replication?  (other than xcopy).
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btomkinsAuthor Commented:
Ok then if there are no alternatives
how big a deal is it to join one of the domains to the others forest?
Will it create much ongoing traffic over the WAN?
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