Domain Functional Level Upgrade Risks

Generally domain and forest functional levels dfls and ffls enable specific features that are not backward compatible with earlier versions of ad on windows server.

Domain functional level upgrade risks. I m preparing to replace our 2003 r2 domain dcs to 2008 r2 and to raise the domain functional level to windows 2008 r2. The process of raising the dfl is done to increase the capabilities and enhance the security of the domain. You must be part of the domain admins group to raise the dfl.

The only impact of raising the domain and forest functional levels is that you will no longer be able to deploy domain controllers from older versions of windows server. Thursday january 27 2011 10 35 pm. Domain functional level dfl.

P rerequisites to raise the domain functional level. In this scenario you can change the domain mode to native mode by using the active directory users computers snap in by using the active directory domains trusts ui mmc snap in or by programmatically changing the value of the ntmixeddomain attribute to 0 on the domaindns. When the domain functional level is raised it not possible to promote operating systems that are running earlier versions of the os.

Member servers aren t impacted. Once the functional level has been upgraded new dcs on running on downlevel versions of windows server cannot be added to the domain or forest. Welche domain controller bei welchem domain functional level unterstützt werden geht ebenfalls auf der liste hervor.

An exception is upgrading from 2016 to 2019. The w indows dfl has new and upgraded set of features in every succeeding os version. Any specific risks other than the normal risk you take when doing an upgrade.

The problems that might arise when installing downlevel dcs become pronounced with new features that change the way objects are replicated i e. I ve read information on requriements rollback changes to ad etc but i didn t find speific information on any known risks for applications that use ad for authentication. Die folgenden tabelle stellt dar wie sich die windows server versionen bezüglich domain functional levels geändert haben.