I have a SBS 2008 system that I am planning to replace very soon. We had hired someone to create a secondary domain controller (RODC) on a WS2012 R2 server a couple of years ago which I thought was operational but I don't think it was completely successful. I attempted to create a third domain controller recently on a WS2016 server and it also doesn't seem to function properly. When I run DCDIAG on the primary (SBS 2008) system it runs successfuly except for some syslog errors. On the WS2012 RODC DCDIAG fails the Advertising, FrsEvent and KCCEvent. The latest one I created fails Advertising but passes the rest with some warnings. But in both cases SYSVOL is not replicating. I would like a fully operational secondary DC that can take over as a primary DC when I transition the SBS 2008 system to WS2016.
I have searched around and it would seem that I should be able to create a secondary DC from the SBS 2008 system. Just not sure why my attempts are failing.