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  • DNS Lost Information on server

    Hello

    This is a strange one, We have our domain contoller and a second domain controller in a co-lo centre, for some reason we lost connection between the two servers. I now have the connection back, but on the second DC in the co-lo centre i don't have DNS. When i click on the dnsmgmt console I get the name of the second DC that all, when i clck on forward and reverse lookup it ask me to add a new zone?. Can i force dns from primary DC

  • #2
    Re: DNS Lost Information on server

    Hi,

    can you provide more info on your AD and DNS setup. is it AD intergrated or is it primary - secondary type ?
    Thanks & Regards
    v-2nas

    MCTS 2008, MCTIP, MCSE 2003, MCSA+Messaging E2K3, MCP, E2K7
    Sr. Wintel Eng. (Investment Bank)
    Independent IT Consultant and Architect
    Blog: http://www.exchadtech.blogspot.com

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    • #3
      Re: DNS Lost Information on server

      hello

      The Ad is primary on head office side then its secondary on the co-lo side

      Comment


      • #4
        Re: DNS Lost Information on server

        Hi
        Sorry Got it wrong its active intergrated
        in forward in domain.local i have this selected
        The option to all dns servers in active directory is that correct?

        Attached Files

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        • #5
          Re: DNS Lost Information on server

          change it to "all domain controllers" instead (if you can)


          when you say you lost connection, how long was it for? Are other AD objects replicating ? (ie, create a new user, does it appear in the second site?)
          can you force replication? Have you checked replication ?
          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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          • #6
            Re: DNS Lost Information on server

            Hello

            This started happen this weekend, We thought it was a probelm with the firewall, this had been checked all the correct ports are open. we do ger event id of 4000 and 9999(see pic). If i add new user on the primary dc it not appear in on the second dc

            Cheers
            Attached Files

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            • #7
              Re: DNS Lost Information on server

              Hi,

              so have you changed replication to all dc in active directory domain?

              Now you need to check if the replication between both the dcs are working or not

              For this push the replication using replmon
              check connection object in AD are created appropriately
              run dcdiag and netdiag for failures/warnings/errors [upload]
              check event viewer specifiy the events with description.
              Thanks & Regards
              v-2nas

              MCTS 2008, MCTIP, MCSE 2003, MCSA+Messaging E2K3, MCP, E2K7
              Sr. Wintel Eng. (Investment Bank)
              Independent IT Consultant and Architect
              Blog: http://www.exchadtech.blogspot.com

              Show your appreciation for my help by giving reputation points

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              • #8
                Re: DNS Lost Information on server

                hello

                A few questions on The forward zone
                _msdcs.Domain.local on the dns is set to dns server active directory forest domain.local

                on domain.local is set to to all domain conroller in the active directory domain.local

                On reverse Zone
                192.168.1.* to all domain controllers in the active directory doamain.local
                10.200.4.* to all domain servers in active directory , this is where the second dc lives in the co-lo

                On Repmon( nice little tool) on serach domain controller I get
                error 1256 the remote system is not avaiable

                Comment


                • #9
                  Re: DNS Lost Information on server

                  Hi,

                  _msdsc.domain.local will be forestDNSZone replication scope set to forest wide. This correct

                  Can you use nslookup and try to do name resolutions for your domain involved, You can manually add the both the dc and then force replication.
                  Thanks & Regards
                  v-2nas

                  MCTS 2008, MCTIP, MCSE 2003, MCSA+Messaging E2K3, MCP, E2K7
                  Sr. Wintel Eng. (Investment Bank)
                  Independent IT Consultant and Architect
                  Blog: http://www.exchadtech.blogspot.com

                  Show your appreciation for my help by giving reputation points

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                  • #10
                    Re: DNS Lost Information on server

                    Hello

                    This is driving me crazy!

                    Nslookup from 2 dc

                    default server dc2.domain.local
                    addpress 10.200.4.1

                    >name dc1.domain.local
                    address 192.168.1.35

                    Question could the trust between the 2 dc somehow been broken?

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                    • #11
                      Re: DNS Lost Information on server

                      Hi

                      looking at most of setting I came across this on the Primary DC

                      On active Directory Sites and services
                      on DC2 Glocal Catalog is not ticked?

                      But DC1 is ticked
                      and DC3 is ticked

                      If i tick this box what will happen?

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                      • #12
                        Re: DNS Lost Information on server

                        Hi,

                        That will make your server GC that's it.

                        Ok starting from your first post as you mentioned dns setting is lost
                        The reason could be if you have secondary dns setup and it lost the contact with the primary one then after sometime it purges the dns data

                        Since you are using AD intergrated dns then dns data would replicated along with AD

                        Since it's not getting updated i suspect it to be a replication issues

                        So i suggested to use replmon and nslookup

                        before we go further and get deviated we need to ensure that replication between both the dns is working fine

                        The cause of broken replication could be but not limited to name resolution improper dns
                        configuration

                        So you create a test account or test dns record and check if it's being replicated over to the other dc
                        use repadmin /syncall command to sync directory partitions [you would need support tools for this to work]
                        Thanks & Regards
                        v-2nas

                        MCTS 2008, MCTIP, MCSE 2003, MCSA+Messaging E2K3, MCP, E2K7
                        Sr. Wintel Eng. (Investment Bank)
                        Independent IT Consultant and Architect
                        Blog: http://www.exchadtech.blogspot.com

                        Show your appreciation for my help by giving reputation points

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