Joining a Windows Server 2012 / 2012 R2 DC to a Samba AD

Revision as of 01:19, 13 May 2017 by Mmuehlfeld (talk | contribs) (Turned important admonition into a note.)


Samba 4.5 introduces support for the directory schemas 56 (Windows Server 2012) and 67 (Windows Server 2012 R2). However, you cannot join the first Windows Server 2012 or 2012 R2 domain controller (DC) directly to a Samba Active Directory (AD), because it uses the Windows management instrumentation (WMI) protocol for several tasks during the process. To work around, you require a Windows Server 2008 or 2008 R2 DC in the domain to join the first 2012 or 2012 R2 DC. After the first DC with this Windows Server version is joined and the directory schema updated, you can this one as replication partner when you join other Windows 2012 or 2012 R2 DCs.


Requirements and Known Limitations

  • All Samba DCs must run 4.5.0 or later. For information about updating, see Updating Samba.
  • Windows Server 2012 and 2012 R2 requires the Windows management instrumentation (WMI) protocol during the join, and for the forest and domain preparation. Samba currently does not support this protocol. Thus you must have an existing Windows domain controller (DC) with WMI support in your domain. For example, you can a Windows Server 2008 or 2008 R2 DC as replication partner during the join. For further information, see Joining a Windows Server 2008 / 2008 R2 DC to a Samba AD.

Network Configuration

  • Click the Start button, search for View network connections, and open the search entry.
  • Right-click to your network adapter and select Properties.
  • Configure the IP settings:
  • Assign a static IP address, enter the subnet mask, and default gateway.
  • Enter the IP of a DNS server that is able to resolve the Active Directory (AD) DNS zone.
  • Click OK to save the settings.

Date and Time Settings

Active Directory uses Kerberos for authentication. Kerberos requires that the domain member and the domain controllers (DC) are having a synchronous time. If the difference exceeds 5 minutes (default), the client is not able to access domain resources for security reasons.

Before you join the domain, check the time configuration:

  • Open the Control Panel.
  • Navigate to Clock, Language and Region.
  • Click Date and Time.
  • Verify the date, time, and time zone settings. Adjust the settings, if necessary.
  • Click OK to save the changes.

FSMO Roles

When you join the first Windows Server 2012 or 2012 R2 host as a domain controller (DC) to an Active Directory (AD) forest, the directory schema and the domain are updated. This update must run on a Windows 2008 or 2008 R2 domain controller (DC). For updating the forest and directory schema, transfer the following two flexible single master operation (FSMO) roles to the Windows DC that is already a domain member:

  • Schema Master
  • Infrastructure Master

To transfer the two FSMO roles to a Windows Server 2008 or 2008 R2 DC, see Transferring and Seizing FSMO_Roles.

If you successfully updated the schema during the first Windows Server 2012 or 2012 R2 join, you can later transfer the roles to a Samba DC again.

Installing the Active Directory Domain Services

  • Start the Server Manager.
  • Click Add roles and features.
  • Select Role-based or feature-based installation and click Next.
  • Click Select a server from the server pool and select the local Windows Server from the list. Click Next.
  • Select Active Directory Domain Services, including all dependencies. Click Next.
  • You do not need to select any additional features. Click Next.
  • Start the installation.
  • Click Close.

Joining the Windows Server to the Domain

  • Log in to your Windows Server 2012 or 2012 installation using the local administrator account.
  • Start the Server Manager.
  • Click the notifier icon on the top navigation bar and click Promote this server to a domain controller.
Join Win2012R2 Server Manager Post Deployment.png
  • Select Add a domain controller to an existing domain, enter the Samba Active Directory (AD) domain name and credentials that are enabled to join a domain controller (DC) to the domain, like the domain administrator account. Click Next.
  • Select the options to enable on the new DC and enter the directory services restore mode (DSRM) password. It is required to boot the Windows DC in safe-mode to restore or repair the AD in case of problems. Click Next.
Join Win2012R2 DS Wizzard Page2.png
  • If you enabled the DNS server option in the previous step, you may see a note, that a delegation for this DNS server cannot be created. Click Next.
  • Samba currently does not support schema replication using the Windows management instrumentation (WMI) protocol. For this reason, select an existing Windows Domain Controller in the domain as replication source and click Next.
Join Win2012R2 DS Wizzard Page3.png
  • Set the folders for the AD database, log files and the Sysvol folder. Click Next.
  • Click Next to confirm the operations, Windows is going to perform.
  • Verify your settings and click Next to start the prerequisite check.
  • Windows runs some prerequisites checks. If any errors are displayed, fix them before you continue. Click Install.
  • The DC promotions begins.
If this is the first Windows Server 2012 or 2012 R2 DC in your AD forest:
The installation wizard is only able to run the AD forest preparation. The domain preparation step fails. To work around:
  • Log in using the domain administrator account to your existing Windows Server 2008 or 2008 R2 installation that owns the pSchema Master" and the "Infrastructure Master" flexible single master operation (FSMO) role.
  • Insert the Windows Server 2012 or Windows 2012 R2 installation DVD.
  • Open a command line and change to the support\adprep folder on the installation DVD. For example, if you DVD drive is D:
> D:
> cd support\adprep\
  • Start the domain preparation:
> adprep /domainprep
  • You see the following message if the preparation succeeds:
Adprep successfully updated the domain-wide information.
  • If the wizard completes successfully, the Windows server is restarted automatically.

Verifying Directory Replication

See Displaying the Replication Statuses on a Windows DC.

The Sysvol Share

During the join, Windows tries to replicate the Sysvol directory content from an existing domain controller (DC). Samba currently does not support the DFS-R protocol. For this reason, the new DC may not show a Sysvol share. To enable the share:

  • Save the following content to a plain text file named Win-Create-Sysvol-Share.reg using a text editor like "Notepad" or "Editor" (not Word/Wordpad/OpenOffice/LibreOffice/etc.):
Windows Registry Editor Version 5.00


  • Log in using an account that is member of the local Administrators group.
  • Double-click the file to import it to the Windows registry.
  • Reboot to take the changes effect.

Sysvol replication

Samba currently does not support the DFS-R protocol required for Sysvol replication. Please manually synchronise the content between DC or use a workaround like Robocopy-based Sysvol Replication.