Functional levels are set at these default levels to give you the option of adding Windows Server based domain controllers to your new Windows Server R2 forest. After you create a forest root domain, the domain functional level for each domain that you add to the Windows Server R2 forest is set to Windows Server However, if you want all domain controllers in your new Windows Server R2 environment to run Windows Server R2 , set the forest functional level, and then the domain functional level, to Windows Server R2 when you install the first domain controller in your forest.
Doing this saves time and enables all forest-level and domain-level features in Windows Server R2. If the forest operates at the Windows Server R2 functional level and you attempt to install Active Directory on a Windows Server -based or Windows Server based member server, or on a Windows based member server, the installation fails.
Although ADMT v3. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Important Windows Server R2 is an xbased operating system. Note Before you raise the domain functional level, you must upgrade all Windows based domain controllers in that domain to Windows Server or Windows Server R2.
Note Before you raise the domain functional level, you must upgrade all Windows Server based domain controllers in that domain to Windows Server or Windows Server R2. Important If the forest operates at the Windows Server functional level and you attempt to install Active Directory on a Windows Server based member server or a Windows based member server, the installation fails.
Important If the forest operates at the Windows Server R2 functional level and you attempt to install Active Directory on a Windows Server -based or Windows Server based member server, or on a Windows based member server, the installation fails. Submit and view feedback for This product This page. View all page feedback. In this article we will look at the functional levels available, how to determine what you have set on your production systems and how to change it if need be and some features you can get from deploying Windows Server as the functional level such as domain rename.
A new feature that you may want to use is 'domain rename'. This is only available if all your systems are running Windows Server This feature is a big help. Domain Rename allows you to replicate portions of a group change instead of the whole group again which cuts down on traffic sent accross the network and helps speed up Active Directory database convergence.
Active Directory domain rename tools provide a way to rename one or more domains in an Active Directory forest. A future article will cover how to use domain rename. Now that you know why you have a functional level and what it is , you should understand how to identify it as well as change it.
Having a mixed environment will ultimately keep you from using many features domain or forest-wide. The following graphic shows a sample worksheet you can create to get and list the levels on your production servers for quick analysis. The columns are easy to understand. Once you have collected this information you can use the next section to help you plan out what you need to do if you want to alter the functional level. Now that you have your sheet, we need to fill it out.
As a result, any domain controller that runs Windows Server R2 and older should be removed from the domain. For migration steps, you can either follow the procedures on TechNet or you can refer to the streamlined set of steps on the Storage Team File Cabinet blog. There have been no new forest or domain functional levels added since Windows Server Later operating system versions can and should be used for domain controllers, however they use Windows Server as the most recent functional levels.
The minimum requirement to add one a domain controller of one of these versions of Windows Server is a Windows Server functional level. This configuration is also known as "Smart card required for interactive logon". A new domain that is created on a domain controller that runs at least Windows Server R2 must be set to the Windows Server domain functional level or higher. Domain-based DFS namespaces running in Windows Server Mode, which includes support for access-based enumeration and increased scalability.
Domain-based namespaces in Windows Server mode also require the forest to use the Windows Server forest functional level. For more information, see Choose a Namespace Type. In order for TGTs to be issued using AES, the domain functional level must be Windows Server or higher and the domain password needs to be changed.
For more information, see Kerberos Enhancements.
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