Forest A - 2012 R2 Forest - All DC's 2012R2
Forest B - 2012 R2 Forest - 2012R2/2008R2 DC's
Forest C - 2003 R2 Forest - 2003 R2 and below DC's and File servers
All Trusts are External Trusts - Forest wide auth
I can connect to resources in Forest B from Forest A with no problems.
I can connect to only one DC in Forest C (Netlogon Share) from Forest A. When I try to connect to other DC's Netlogon shares or File Server shares in Forest C from Forest A, I get Access Denied or no RPC Server Available.