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Thread: Inter site topology generator invalid

  1. #1
    Join Date
    Jan 2009
    Posts
    97

    Inter site topology generator invalid

    Hello friends,

    I'm facing some replication issues from one of my remote servers to my head office server. I found that the Inter-Site Topology Generator for the remote site is listed as Invalid on my head office server.can i possibly alter it manually this? anybody know how to can fix it up?

    thanks for reading me !!

  2. #2
    Join Date
    Apr 2008
    Posts
    3,424

    Re: Inter site topology generator invalid

    ISTG has invalid on all Domain Controller on the network after you demote a DC and trasfer roles and then rebuild it.DC holds the role ISTG Server,If demoted Domain Controller is the first DC in site.Originally the first server in the site becomes the ISTG owner and this this role is communicated by normal AD replication.beyond this role is not altered automatically. another DC as an ISTG server doesn't take over unless it knows that DC hold ISTG server has failed. Server holding ISTG role denotes other domain controllers about its presence by writing the InterSiteTopologyGenerator attribute in Configuration Naming Context at a specified interval.

    edit this keys in order to make the things fine
    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NTDS\Parameters

    Value Name: KCC site generator renewal interval (minutes)
    Value Data: Number of minutes between updates to Active Directory

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NTDS\Parameters
    Value Name: KCC site generator fail-over (minutes)
    Value Data: Time that must elapse before a new ISTG is selected, in minutes.

  3. #3
    Join Date
    Feb 2008
    Posts
    2,635

    Re: Inter site topology generator invalid

    You can possibly run diagnostics against your Active Directory domain.What type of errors are listed in the Event Log?If you have no tools on it get them from your server install disk.d:\support\tools\setup.exe
    Run dcdiag, netdiag and repadmin in verbose mode, dcdiag /e /c /v /s: DC_Name /f:c:\dcdiag.log, netdiag.exe /v > c:\netdiag.log (On each dc),* repadmin.exe /showrepl dc, /verbose /all /intersite > c:\repl.txt ..If you collected a gui script, it should be simple to configure and run
    (DCDiag and NetDiag). It also has the option to run individual tests
    without having to learn all the switch options. The details will be output
    in notepad text files that pop up.

  4. #4
    Join Date
    May 2008
    Posts
    2,945

    Re: Inter site topology generator invalid

    You are free do this with ADSIEdit or LDP the "interSiteTopologyGenerator" attribute of the "NTDS Site Settings" object includes the distinguished Name of the ISTG.To set a new DC as the ISTG you need to emphasize the distinguished Name
    of the NTDS Settings object that belongs to a healthy DC. like: CN=NTDS
    Settings
    CN=CDC01
    CN=Servers
    CN=BRANCH
    CN=Sites
    CN=Configuration
    DC=AD
    DC=LAN

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