"Windows Server's OU" does not exist in fresh Server 2012 R2 install
Under 9.1.1. Troubleshooting Tips of the 9.3 documentation, we find this:
"Try creating a Computer entry on the Windows server’s OU. When creating this entry, enter the FreeNAS® hostname in the “name” field. Make sure that it is under 15 characters and that it is the same name as the one set in the “Hostname” field in Network ‣ Global Configuration and the “NetBIOS Name” in Directory Service ‣ Active Directory settings."
Note that there is no such OU as: "Windows Server's OU" on a fresh install of Windows Server 2012 R2 (not sure about others).
#2 Updated by DENNY VANDEMAELE over 6 years ago
The problem is that it adds confusion. People will look for the "Window's Server OU" and not find it. Then they may think they can just create one, however, a newly created OU (no matter what you name it) will have no special permissions/features.
I just confirmed that Server 2008 R2 out of the box does not have "Window's Server OU" either.
#4 Updated by DENNY VANDEMAELE over 6 years ago
I'm not sure of the intentions of the original writer of the documentation, so I think your SAMBA/AD programmer needs to be consulted.
It could be that there was a "Window's Server OU" in previous versions of windows server (below 2008 R2). All I know is that this part, "Try creating a Computer entry on the Windows server’s OU." is incorrect information for at least Server 2008 R2, Server 2012, and Server 2012 R2 (and possibly more).