I have a branch office that I have created a site to site VPN connection through two firewall/routers. I can ping the servers using IP addresses and DNS names and can access the servers through Remote connection sessions. I can't get windows XP Pro in the branch office to join the domain. I get an error message that The RPC Server is unavailable. The RPC services are running on the server. I have research this issue and ran netdiag tool and everything passed. I ran the Dcdiag tool get this one error “Cannot call DsBind error to computernameDC”. I have change windows XP to use TCP for Kerberos authentication and still get the same error. Any help would be greatly appreciated.
