Route active directory authentication to different site.

Hi I have an AD forest with several child domains and physical sites connected with VPN connections. Not all sites have VPNs to every other site.
Say I have 3 sites A, B and C
Site A  is connected to Site B by VPN
Site B is connected to Site C by VPN.

We have a top level domain with domain controllers in all three sites. We also have a child domain that only has domain controllers in Site C

What I wanted to know is is it possible to configure AD so that a User in Site A can logon to the child domain even if they can't directly route to the domain controller of that domain. Is it possible to get the domain controllers from the parent domain to process the authentication?

Any ideas or is this not possible with a direct connection.
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AmericomConnect With a Mentor Commented:
That is not possible. The other thing that comes up to my mind is IAS where you can forward authentication request to another domain's IAS. But this also will required you to open connection from IAS server in Site C <-> IAS in Site A. Without connection between the two network, that would not be an option.
The acutal allow authentication will eventually be it's own DC in it's own domain for it's user that exist in that domain, regardless how your AD design topology is configured. So, the only thing I can think of is that user account belong to the child domain in site C trying to logon or authenticate from site A would have problem if the firewall is blocking it. Assuming that you already have trust either by default or manually created between all domains, and your network is connected between A and B as well as B and C, the network connection is connected between A and C via B. Unless you have firewall blocking it. So, in therory, if firewall is not blocking traffic from A to C, you should not have any issue.
matthewsj11Author Commented:
There is no direct routing between sites A and C which is why I wanted to know if it was possible to relay the authentication. If possible I want to avoid configuring the routing.

I am guessing that it is not possible.
matthewsj11Author Commented:
Thanks I did not think this was possible but was hoping for a bright idea from someone.
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