Forum Discussion
Tien Ngo Thanh
Jan 09, 2021Iron Contributor
raise forest functional level
Need check what before raise forest functional level to 2012 r2 ? and can rollback if use windows server 2012 r2 and current forest function is 2008 r2 ?
Yes, it is doable.
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- Tien Ngo ThanhIron Contributor
Read on here about roll back options and dependencies
What Are Active Directory Functional Levels?: Active Directory | Microsoft Docs
- Tien Ngo ThanhIron Contributoras link Docs My understand is our windows 2012 r2 (enable Active Directory Recycle Bin ) upgrade forest,domain from 2008 r2 to 2012 r2 then can downgrade because windows 2012 r2 is support ?
Shouldn't be a problem as long as the 2008 are gone first.
To activate the newest forest-wide features, all the domain controllers in the forest must be running the Windows Server operating system version that corresponds to the desired forest functional level. Additionally, the current domain functional level must already be at the newest level. If these requirements are met, the administrator can raise the forest functional level.
How to raise Active Directory domain and forest functional levels - Windows Server | Microsoft Docs
- Tien Ngo ThanhIron Contributor
Dave Patrickour system have exchange 2013 and crm 2015 and an app use kerberos (this effect kerberos ?)
For those products I'd reach out to subject matter experts in dedicated forums over here.
office-exchange-server-administration - Microsoft Q&A
Microsoft Dynamics Social Engagement Forum - Support & Help
- farismalaebSteel Contributor
Hi,
usually, not much to do, but you need to confirm that the application in your environment and infrastructure are compatible with don't have any issue with this, one of the application is Exchange, Check this https://docs.microsoft.com/en-us/exchange/plan-and-deploy/supportability-matrix?view=exchserver-2019
Also, you need to make sure that you DONT have any domain controller older than the function level you will have, check this here https://docs.microsoft.com/en-us/troubleshoot/windows-server/identity/raise-active-directory-domain-forest-functional-levels
To downgrade, I don't think there is a possible way to downgrade easily, its one way, but if you still need to downgrade, you will need to do Forest Recovery, But this site talks about how to downgrade
I did not try these steps so you do the restoration at your own risk.
most of other application usually do basic Read/Write operation to AD and wont care much about the AD Forst Function level,