WS2016: Demote Domain Level

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Description:

Follow these steps to demote a WS2016 DC to a 2012r2 domain so 2012r2 DC’s can join the domain.

To Resolve:

  1. Open Admin PS on the domain controller and type:

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    (Get-ADForest).ForestMode	
Set-ADForestMode -ForestMode Windows2012r2Forest
(Get-ADForest).ForestMode	
(Get-ADDomain).DomainMode
Set-ADDomainMode -DomainMode Windows2012r2Domain
(Get-ADDomain).DomainMode

  2. You really only need the two Set- commands, I just put the others to see the before and after => look at the properties before and after you change them!

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