Registry file available for validating your windows
So how do you know for sure and, more importantly, how do you track down the precise error? To run it, at the command prompt, type repadmin /bind.
If you are having RPC problems, you may see a message such as this: "There are no more endpoints available from the endpoint mapper." That’s your first clue that the problem is related to RPC.
For instance, if the promotion fails, take a look at the log. The errors listed will indicate something to the effect that the directory service failed to replicate the partition, or failed to create the object.
At the end of the message there will be an error code.
The client computer sends a message to the server computer with certain arguments.
The server responds to the client with a message that contains the results of the executed program.
Verify that your client can successfully ping the server that is having connectivity problems.
Then the Endpoint Mapper tells the client which port a requested service is listening on.When using Active Directory Users and Computers, you may see the error that states, "The specified domain either does not exist or could not be contacted." Logging on to the domain may give you an error that claims, "The system cannot log you on to this domain because the system’s computer account in its primary domain is missing or the password on that account is incorrect."When the Microsoft Outlook client tries to communicate with Exchange Server, RPC failures may give the client a misleading error such as, "Your logon information is incorrect," or "Outlook could not log on."In addition to these errors, when the RPC service is not available, you may experience other problems.For instance, you may not be able to browse the domain in My Network Places, or you may not be able to open the Group Policy snap-in.The Gpotool tool, which checks the consistency of Group Policy objects on domain controllers, will also give you similar errors if RPC is to blame.2003 server to a doman controller using the Dcpromo tool can also reveal issues with RPC.
Integral to this process is the endpoint—the name, port, or group of ports on a computer that is monitored by a server for incoming client requests.