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Mirgating AD to New Domain from 2012R2 to 2008R2

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  • Mirgating AD to New Domain from 2012R2 to 2008R2

    Hi All,


    I have a Windows server 2012 R2 Data center with AD-DNS integrated with FFL & DFL windows 2012 R2. Now due to some compatibility issues, we want to install Window 2008 R2 standard with out much effecting users & Computers joined in AD.
    1. Is there a ADMT tool which support migration from win 2012 to win 2008.
    2. Any other ways to migrate to moves AD from Win 2012 to Win 2008.
    3. Will seizeing FSMO roles from win 2012 to Win 2008 (in which Win 2008 is domain joined server.

    -Many Thanks in Advance
    -Akash Kiran

  • #2
    Re: Mirgating AD to New Domain from 2012R2 to 2008R2

    What is your Infrastructure and Domain function level? if is it on Windows2k8R2 level. Then you should able to promote Windows2k8R2 as a domain member. Transfer all the roles to win2k8R2 DC then demote your Win2k12 server.

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    • #3
      Re: Mirgating AD to New Domain from 2012R2 to 2008R2

      He does say it is at 2012R2 FL so that won't work. That means absolutely no earlier DCs

      From a quick about ADMT, there is not clear way to do it - how many users/computers are we talking about?
      Tom Jones
      MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
      PhD, MSc, FIAP, MIITT
      IT Trainer / Consultant
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      • #4
        Re: Mirgating AD to New Domain from 2012R2 to 2008R2

        I assume it is still the case in 2012 R2 but starting with 2008 R2 you can roll back FFL/DFL providing you meet the pre-reqs.

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        • #5
          Re: Mirgating AD to New Domain from 2012R2 to 2008R2

          Hey Guys,
          Found a solution use the below commands to degrade FFL & DFL in windows 2012

          Set-AdForestMode -identity contoso.com -forestmode Windows2008Forest
          Set-AdDomainMode -identity contoso.com -domainmode Windows2008Domain

          P.S : contoso.com is your FQDN

          Consider following KB article 2753560

          -Thanks
          Akash Kiran

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          • #6
            Re: Mirgating AD to New Domain from 2012R2 to 2008R2

            Originally posted by akashkrn69 View Post
            Hey Guys,
            Found a solution use the below commands to degrade FFL & DFL in windows 2012

            Set-AdForestMode -identity contoso.com -forestmode Windows2008Forest
            Set-AdDomainMode -identity contoso.com -domainmode Windows2008Domain

            P.S : contoso.com is your FQDN

            Consider following KB article 2753560

            -Thanks
            Akash Kiran

            That is good finding.. Its worth to test it before you running on your production.. maybe blowup a virtual DC on win2k12 then try to down grade the role.
            If it works successfully.. then you should able to promote win2k8r2 dc and demote win2k12.

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            • #7
              Re: Mirgating AD to New Domain from 2012R2 to 2008R2

              akash - do you definitely need a 2008 R2 DC, or just a 2008 R2 Member server ?
              Please do show your appreciation to those who assist you by leaving Rep Point https://www.petri.com/forums/core/im.../icon_beer.gif

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              • #8
                Re: Mirgating AD to New Domain from 2012R2 to 2008R2

                Originally posted by tehcamel View Post
                akash - do you definitely need a 2008 R2 DC, or just a 2008 R2 Member server ?
                Yeah, what exactly are your compatibility issues?

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