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    Additional DC not functioning if the Primary DC is down !!

    IT Discussion
    active directory
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    • D
      Dashrender @IT-ADMIN
      last edited by

      @IT-ADMIN said:

      @coliver said:

      What version of AD/Windows Server are you running?

      both are windows server 2008 entreprise R2

      Wow - hefty licenses there.

      J 1 Reply Last reply Reply Quote 0
      • I
        IT-ADMIN @coliver
        last edited by

        @coliver said:

        @IT-ADMIN Right-click Active Directory Users and Computers and click Change Domain Controller.

        there is nothing called Change Domain Controller. in the submenu :

        0_1455045225008_2016-02-09_220941.png

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        • D
          Dashrender
          last edited by Dashrender

          you launch it first, then change it at the top inside ADUC.

          0_1455045326587_2016-02-09 13_14_04-Active Directory Users and Computers.png

          I 1 Reply Last reply Reply Quote 0
          • I
            IT-ADMIN @Dashrender
            last edited by

            @Dashrender said:

            you launch it first, then change it at the top inside ADUC.

            0_1455045326587_2016-02-09 13_14_04-Active Directory Users and Computers.png

            great, i can see it now but i do not know what to type in :

            0_1455045430627_2016-02-09_221625.png

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            • D
              Dashrender
              last edited by

              type in the name or IP of the new DC.

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              • I
                IT-ADMIN
                last edited by

                i think since the OK button is not activated, the DC2 is not seeing itself as a DC

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                • D
                  Dashrender
                  last edited by

                  Did you run DCPromo on the new Domain Controller so that it actually became a DC?

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                  • D
                    Dashrender
                    last edited by

                    With the working DC online, when you go to ADUC and look under the Domain Controllers OU, do you see both servers?

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                    • I
                      IT-ADMIN @Dashrender
                      last edited by

                      @Dashrender said:

                      Did you run DCPromo on the new Domain Controller so that it actually became a DC?

                      yeah off course, and choose it to be global catalog and DNS

                      1 Reply Last reply Reply Quote 0
                      • I
                        IT-ADMIN @Dashrender
                        last edited by

                        @Dashrender said:

                        With the working DC online, when you go to ADUC and look under the Domain Controllers OU, do you see both servers?

                        yeah in DC1, i can see in both DC in domain controllers OU

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                        • I
                          IT-ADMIN
                          last edited by IT-ADMIN

                          now the DC2 is offline and i set a static IP to it and set DNS to point to himself (because it is offline)
                          after i enter his ip, it shows online but giving me error message

                          0_1455045931145_444444.png

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                          • I
                            IT-ADMIN @IT-ADMIN
                            last edited by

                            @IT-ADMIN 0_1455046058773_2016-02-09_222702.png

                            D 1 Reply Last reply Reply Quote 0
                            • C
                              coliver @IT-ADMIN
                              last edited by

                              @IT-ADMIN said:

                              @Dashrender said:

                              With the working DC online, when you go to ADUC and look under the Domain Controllers OU, do you see both servers?

                              yeah in DC1, i can see in both DC in domain controllers OU

                              Can you switch to DC2 when DC1 is online?

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                              • J
                                JaredBusch
                                last edited by JaredBusch

                                The preferred DNS server of the network card in your domain controllers should always point to themselves. Well, assuming that you are using standard Windows DNS.

                                The alternate should then be the other DC.

                                On DC 1
                                DNS Preferred: 127.0.0.1
                                DNS Alternate: 192.168.1.XX <- IP of DC2

                                On DC 2
                                DNS Preferred: 127.0.0.1
                                DNS Alternate: 192.168.1.XX <- IP of DC1

                                D 1 Reply Last reply Reply Quote 1
                                • J
                                  JaredBusch @Dashrender
                                  last edited by

                                  @Dashrender said:

                                  @IT-ADMIN said:

                                  @coliver said:

                                  What version of AD/Windows Server are you running?

                                  both are windows server 2008 entreprise R2

                                  Wow - hefty licenses there.

                                  No, we already now that about his organization.

                                  1 Reply Last reply Reply Quote 0
                                  • D
                                    Dashrender @JaredBusch
                                    last edited by

                                    @JaredBusch said:

                                    The preferred DNS server of the network card in your domain controllers should always point to themselves. Well, assuming that you are using standard Windows DNS.

                                    The alternate should then be the other DC.

                                    On DC 1
                                    DNS Preferred: 127.0.0.1
                                    DNS Alternate: 192.168.1.XX <- IP of DC2

                                    On DC 2
                                    DNS Preferred: 127.0.0.1
                                    DNS Alternate: 192.168.1.XX <- IP of DC1

                                    I typically point to the other DC for my Preferred DNS, and myself second. This allows for faster booting, but I see reasons for either way.

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                                    • I
                                      IT-ADMIN
                                      last edited by

                                      i'm so sorry for this delay, because it is midnight here, so do you think DNS setting make sense even if the DC2 is offline ??

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                                      • DenisKelleyD
                                        DenisKelley
                                        last edited by

                                        Best explanation regarding this that I've seen. See Jay's response:
                                        http://community.spiceworks.com/topic/post/4301599

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                                        • I
                                          IT-ADMIN
                                          last edited by

                                          let us suppose that DC2 is offline and cannot see DC1 (which is the main reason i want to make DC2 for high availability) how DNS setting make any difference ??

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                                          • D
                                            Dashrender
                                            last edited by

                                            Yes.

                                            Let's assume DC2 is offline, but you want to see if you can run ADUC on DC2. When you run ADUC it uses DNS to try to open and failes.

                                            But if you put in 127.0.0.1 as JB suggests, then it will still work, even with the network card unplugged.

                                            I 1 Reply Last reply Reply Quote 0
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