Domain Functional Level Upgrade

After you set the domain functional level to a certain value in windows server 2008 r2 you cannot roll back or lower the domain functional level with one exception.

Domain functional level upgrade. Right click the domain you want to raise the functional level of as in example below and then select raise domain functional level. The domain also has to use dfs r as the engine to replicate sysvol. After you set the domain functional level to a certain value you cannot roll back or lower the domain functional level with the following exceptions.

When you raise the domain functional level to windows server 2016 and if the forest functional level is windows server 2012 or lower you have the option of rolling the domain functional level back to windows server 2012 or windows server 2012 r2. The domain functional level is raised to the second functional level by using the ldp exe utility or the adsiedit msc utility. When you raise the domain functional level to windows server 2008 r2 and if the forest functional level is windows server 2008 or lower you have the option of rolling the domain functional level back to windows server 2008.

For example if your current domain functional level is windows 2000 native as in example below then you can either raise the domain functional level to windows server 2003 or windows server 2008. Event id 15 s come through. 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.

Right click on the domain name and select raise domain functional level. Restarted kdc service on all the domain controllers and still had a couple of. The domain functional level is programmatically raised to the second functional level by directly modifying the value of the msdsbehaviorversion attribute on the domaindns object.

Before you raise the domain functional level you must upgrade all windows server 2003 based domain controllers in that domain to windows server 2008 or windows server 2008 r2. In the window that opens select the functional level windows server 2016 and click the raise button. The problems that might arise when installing downlevel dcs become pronounced with new features that change the way objects are replicated i e.

Before you can raise the forest functional level all domains in the forest must be upgraded to the same or a higher domain functional level. After you upgrade all the windows server 2003 based domain controllers in the forest to windows server 2008 or windows server 2008 r2 you can raise the forest functional level to windows server 2008 or windows server 2008 r2. 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.