[Samba] DC replication not working

[Steve Campbell]

I've got a couple of Samba4 DCs running as VMs for testing. The primary 
AD DC went smoothly. The second VM joined properly and all but it's only 
when I get to the replication tests that I see errors. This is following 
the wiki

When I run the command "samba-tool drs kcc -Uadministrator 
windowsdc.mycrap.cnpapers.dom" I get an error indicating that 
windowsdc.mycrap.cnpapers.dom is not found. Is "windowsdc" correct?

When I run the command "samba-tool drs showrepl" I get a 
"DsReplicaGetInfo of type 0 failed NT_STATUS_RPC_PROTOCOL_ERROR" message.

What step have I missed, please?

steve campbell