1. Verify the status and startup type for the following services on the server that gets the error:Type of computer RPC service RPC Locator service
Windows Server 2003-based domain controller Started, Automatic Stopped, Manual
Windows Server 2003-based member server Started, Automatic Stopped, Manual
Windows Server 2003-based standalone server Started, Automatic Stopped, Manual
Windows 2000 Server-based domain controller Started, Automatic Started, Automatic
Windows 2000 Server-based member server Started, Automatic Started, Manual
Windows 2000 Server-based standalone server Started, Automatic Stopped, Manual
If you make any changes to the RPC service or to the RPC Locator service settings, restart the computer, and then test for the problem again.
2. Verify that the following keys exist in the registry (the keys are grouped according to operating system).
Windows XP, Windows Server 2003 and Microsoft Windows 2000
Verify that the ClientProtocols key exists under the HKEY_Local_Machine\Software\Microsoft\Rpcregistry subkey and that the ClientProtocolsentry contains at least the following five default values: Name Type Data
ncacn_http REG_SZ rpcrt4.dll
ncacn_ip_tcp REG_SZ rpcrt4.dll
ncacn_nb_tcp REG_SZ rpcrt4.dll
ncacn_np REG_SZ rpcrt4.dll
ncacn_ip_udp REG_SZ rpcrt4.dll
3. Verify that DNS is working correctly.
4. Verify connectivity:
1) Ports greater than 1024 are not blocked. (portqry)
2) Not blackhole in network path (ping -l -f)
3) Firewall/AV/Backup software/NIC drivers etc.
4) there are ports available for RPC (netstat)