Upgrade my DC 2003 to 2012R2

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    seedorf
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    #164817

    Hello,

    I had 2 DC under Windows 2003 Server Standard Edition. My goal is to replace them by a new DC under Windows 2012R2.

    I fellow the steps described here to add them:

    http://blogs.technet.com/b/canitpro/archive/2013/05/05/step-by-step-adding-a-windows-server-2012-domain-controller-to-an-existing-windows-2003-network.aspx

    I tested the replications and all seems to be ok.

    After some days, i tried to remove the old 2003 servers from my AD fellowing the steps here:

    http://blogs.technet.com/b/canitpro/archive/2014/04/02/step-by-step-active-directory-migration-from-windows-server-2003-to-windows-server-2012.aspx

    I exchanged the IP addresses, i gaved to the new 2012R2 servers the IP addresses of the 2003 servers and gave a new IPs to the 2003 Servers.

    I was able to dcpromo one of the two 2003 servers, but got an error with the second (the one who owned the FSMO roles). The error said that there is no Domain Controller Detected. I seems that the 2003 DC doesn’t see the 2012R2 DCs even if i have no errors with replications.

    When i disconnect the 2003 DC from the network, i’m not able to add workstations to the domain neither authenticate users.

    The 2012R2 DC are Global Catalogs.

    There is no Firewall between the servers.

    Did you have any idea about the cause of that problem? I’m getting somes tickets from users saying that there is some trouble with authentication, for example, users change there passwords and say that they are still authenticating useing the old passwords.

    Thank you

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