Considering the RPC Protocol 'ncacn_ip_tcp', setting WinC client and WinNTC dispatcher security ON would help in this regards.
- Enable Dispatcher Security and restart the Dispatcher.
- Enabled Client application security as follows:
--- Open application INI file
--- Locate [RemoteWinNT] section and update following entries:
Note: Make sure to keep SecurityLevel higher or equal to Dispatcher security level.
For more details please refer Plex help 'RPC Security Considerations'.
Regarding RPCPing utility, there is slight differences in Windows client & Server operating considering RPC security.
As mentioned, "rpcping -t ncacn_ip_tcp" fails with exception on Windows 7/10 but succeeds on Windows Server 2012/16.
To make RPCPing utility working on Windows 7/10, pass the authentication parameters to RPCPing utility, e.g.
rpcping -t ncacn_ip_tcp -I "username,domain,password" -a connect -u 10
Note: -a: The security level, -u: Authentication scheme (NTLM is 10).