Domain Functional Level 2008 R2 Vs 2012 R2
In this article well show you how to raise your Active Directory domain and forest functional level from Windows Server 2012 R2 to Windows Server 2016. Forest Level Windows Server 2012.
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All domains that are subsequently added to the forest will operate at the Windows Server 2008 R2 domain functional level by default.
Domain functional level 2008 r2 vs 2012 r2. The second restriction for which there is a limited exception on Windows Server 2008 R2 is that once upgraded the Domain or Forest Functional Level cannot later be downgraded. Domain controllers running Windows Server 2012 or 2012 R2 could be added to the domain but Active Directory capabilities that were introduced in Windows Server 2012 or 2012 R2 cannot be used because the domain functional level prevents it. If recent surveys cited by tech blogs and mainstream media are to be believed then Windows Server 2012 is a win.
The domain level should have very little effect on a web server. Even Linux OS can join to Windows Server 2008 R2 Domain. Unless your ERP application has very deep hooks into active directory you should be fine running your forestdomain at a 2012 functional level and having a 2008 R2 member server with IIS running your ERP app.
Microsoft reveals that according to one survey 65 of customers were satisfied with the new platform which was released on August 1 2012. The company also says that the new hypervisor is getting raves with 77 of companies already using Hyper-V or open to using it. I tried the DCPROMO command but I was prompted to use the Server Manager in 2012 to try to promote this 2012 server.
However the rollback can be performed in only the specific scenarios that are described in the Technet article about the Active Directory functional levels. If you are at this point continue on if not you might want to read back a couple steps and see where things ventured off course. With Windows Server 2012 and R2 it is possible to roll back forest and domain functional level with limitation as defined in table in the link.
There are some explanations with the functions up to Windows Server 2008 R2 and some on the differences between Windows Server 2008 R2 and Windows Server 2012. Domain-based DFS namespaces running in Windows Server 2008 Mode which includes support for access-based enumeration and increased scalability. Domain functional levels also limit the types of domain controllers that can participate in the domain.
I have a single domain controller Windows Server 2008 R2 Server. If you have the functional level to Windows 2012 R2 then you will be able to have full access of all the features in server 2012 R2 without any restrictions. To prevent these issues from arising a new DC must be at the same level or greater than the functional level of the domain or forest.
Event ID 15s come through. Add first Server 2012 R2 Domain Controller At this point you should have one Server 2008 R2 Domain Controller and a blank Server 2012 R2 machine joined to the domain ready for the Active Directory services. All of the features that are available at the Windows Server 2008 R2 forest functional level but no additional features.
It is operating at 2008 R2 domain functional level. As you can see the domain with a DFL of Windows Server 2012 R2 on the left has the additional redtrictedAdmin option with mstscexe while the domain with a DFL of Windows 2008 does not. Restarted KDC service on all the domain controllers and still had a couple of.
If you have to revert to a lower functional level with a version of Windows Server that is earlier than Windows Server 2008 R2 you must rebuild the domain or forest or restore it from a backup copy. I am currently installing a Windows Server 2012 server that will eventually replace the 2008 R2 server. After raising domain and forest functional levels from 2003 to Server 2008 R2 we started to get a few Event ID 15 on the domain controllers for a couple of service accounts.
Today I recognized that it is not easy to find a comprehensive summary table about Active Directory Domain and Forest Functional Levels operating mode on the internet. A new domain that is created on a domain controller that runs at least Windows Server 2012 R2 must be set to the Windows Server 2008 domain functional level or higher. With the Windows Server 2008 R2 operating system the changes to domain functional levels and to forest functional levels can be rolled back.
For example if you have Windows Server 2016 domain controllers and the domain functional level is only Windows Server 2003 you wont be able to use the Active Directory Recycle Bin introduced in the AD version in Windows Server 2008 R2. Windows Server 2008 Domain and Forest Functional Levels by Scott Lowe in The Enterprise Cloud in Microsoft on March 10 2008 702 AM PST. The only issue that will prevent you from joining 2012 R2 to server 2008 R2 is the forest and domain functional level.
Suppose when you have set forest and domain functional level to Windows Server 2016 you cannot add DCs running Windows Server 2012 or 2008. During ADDS deployment if you have set forest functional level to Windows Server 2012 R2 you cannot set the domain functional level lower than Windows Server 2012 R2 like Windows Server 2008 or 2003.
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