The RPC server is unavailable

I'm trying to join a Windows 10 workstation to a Samba Active Directory. Using a "join" too: ForensiT's Traswiz, I attempted the join but it always fails with the message:
Quote:

The following error occured attempting to connect to the domain hprs.locl: The RPC server is unavailable.

I assume this means an rpc server on the Linux box needs to be running. I started '/usr/sbin/rpcbind -l -w' and '/sbin/rpc.stad', but that didn't help. Another poster elsewhere said this is not the right rpc: "This is not Samba, nor even DCE/RPC, it is another unix-historical RPC system (ONCRPC) used essentially only for NFS".

Does anyone have an idea of what Linux rpc server Windows might be looking for?