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Unable to promote DC on Windows 2012

    Question

  • I have 2 Windows 2012 servers.  the first is the main DC, the second is the problem.  Installed a fresh copy of Windows 2012, connected to the domain and installed DC role and rebooted the server once completed.

    The server starts and identifies that I must promote this server to a DC.  I enter all of the required information and then get the error:

    Verification of replica failed. An Active Directory domain controller for the domain "xxxx.local" could not be contacted. Ensure that you supplied the correct DNS domain name

    Verified the DNS address, re-entered the DC authorization info and still I get the error.  The second server is a Hyper-v with 8 cores and 32 GB of RAM.

    What is the problem and how do I fix it?

    Thanks for any help.


    cjb

    Thursday, January 03, 2013 9:17 PM

Answers

  • Hi,

    From the server that has the replication issue's are you enable to do an nslookup of xxxx.local?

    Is  your main domain controller configured as your DNS server in the properties of the network card? (only when on server 1 is used for DNS).

    Please read the following article on howto Install a Replica Windows Server 2012 Domain Controller in an Existing Domain.

    Kind Regards,


    - Dion


    Thursday, January 03, 2013 9:54 PM
  • Hi,

    Also try to check the connectivity between your main DC and the new server with " ping command-line " , and verify that your firewall  does not block traffic between the two servers.

    Regards;<o:p></o:p>



    Oussama Oueslati | System Engineer | vNext Consulting

    Thursday, January 03, 2013 10:36 PM
  • Hi cjb,


    Please also let us know the following:


    1. Is your first DC a VM or physical server?

    2. If the first DC is a physical server, please make sure the second DC connects to your internal network via external virtual switch.


    Meanwhile, please check if you can nslookup your domain “xxxx.local” from the second server.


    If issue persists, please provide us unedited ipconfig /all and nslookup xxxx.local from both servers.


    More reference:

    Install a Replica Windows Server 2012 Domain Controller in an Existing Domain (Level 200)


    Hope this helps.


    Jeremy Wu
    TechNet Community Support

    Friday, January 04, 2013 6:45 AM
  • Assuming that you have health Windows server 2012 Domain Controller. have you added ur second serever to Domain ?

    1. Check Ip config of Second Windows Server 2012 - Primary DNS address should be your First 2012 Domain Controller IP.
    2. User Port Query tool and query following ports from your second server.

    LDAP : 389

    GC: 3268

    KERBROS:88

    RPC:135

    DNS: 53

    if some of the filtered , it should be firewall issues between your second server to Primary DC. Open those ports in firewall as required.


    Regards, Srinivasu.Muchcherla

    Friday, January 04, 2013 1:08 PM

All replies

  • Hi,

    From the server that has the replication issue's are you enable to do an nslookup of xxxx.local?

    Is  your main domain controller configured as your DNS server in the properties of the network card? (only when on server 1 is used for DNS).

    Please read the following article on howto Install a Replica Windows Server 2012 Domain Controller in an Existing Domain.

    Kind Regards,


    - Dion


    Thursday, January 03, 2013 9:54 PM
  • Hi,

    Also try to check the connectivity between your main DC and the new server with " ping command-line " , and verify that your firewall  does not block traffic between the two servers.

    Regards;<o:p></o:p>



    Oussama Oueslati | System Engineer | vNext Consulting

    Thursday, January 03, 2013 10:36 PM
  • Hi cjb,


    Please also let us know the following:


    1. Is your first DC a VM or physical server?

    2. If the first DC is a physical server, please make sure the second DC connects to your internal network via external virtual switch.


    Meanwhile, please check if you can nslookup your domain “xxxx.local” from the second server.


    If issue persists, please provide us unedited ipconfig /all and nslookup xxxx.local from both servers.


    More reference:

    Install a Replica Windows Server 2012 Domain Controller in an Existing Domain (Level 200)


    Hope this helps.


    Jeremy Wu
    TechNet Community Support

    Friday, January 04, 2013 6:45 AM
  • Assuming that you have health Windows server 2012 Domain Controller. have you added ur second serever to Domain ?

    1. Check Ip config of Second Windows Server 2012 - Primary DNS address should be your First 2012 Domain Controller IP.
    2. User Port Query tool and query following ports from your second server.

    LDAP : 389

    GC: 3268

    KERBROS:88

    RPC:135

    DNS: 53

    if some of the filtered , it should be firewall issues between your second server to Primary DC. Open those ports in firewall as required.


    Regards, Srinivasu.Muchcherla

    Friday, January 04, 2013 1:08 PM