I'm setting up a new domain on a new server 2003 r2 to replace our old domain on an old server 2003, both have sp2 and are on the same network. I can see the two domains in the network and the 2 servers can resolve names to ips, but when I try to use the ADMT to migrate users or try to setup a Domain Trust between the 2 I get an RPC error on either side basically saying the RPC server is unavailable. Also tried adding each dc to each other's dns server as a secondary under the Forward Lookup Zones but that fails to work saying the transfer failed. RPC is running on both as is the RPC locator. What am I missing here? Thanks for any help.