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Thread: A Global Catalog Server could not be located - All GC's are down

  1. #1
    Join Date
    Jul 2004
    Posts
    153

    A Global Catalog Server could not be located - All GC's are down

    If I am trying to add a new user into our active directory then I am getting this error "windows cannot verify that the user name is unique because the following error occured while trying to contact the global catalog server: The server is not operational." If I am checking in the ntds settings properties there is a tick on the global catalog. After I do a dcdiag, then I am getting the below errors:

    Domain Controller Diagnosis

    Performing initial setup:
    * Verifying that the local machine nwscdc2, is a DC.
    * Connecting to directory service on server nwscdc2.
    * Collecting site info.
    * Identifying all servers.
    * Identifying all NC cross-refs.
    * Found 2 DC(s). Testing 2 of them.
    Done gathering initial info.

    Doing initial required tests

    Testing server: Default-First-Site-Name\NWSCDC
    Starting test: Connectivity
    * Active Directory LDAP Services Check
    * Active Directory RPC Services Check
    The clock difference between the home server NWSCDC2 and target
    server

    NWSCDC is greater than one minute. This may cause Kerberos authentication failures. Please check that the time service is working properly. You may need to resynchonize the time between these servers.

    ......................... NWSCDC passed test Connectivity

    Testing server: Default-First-Site-Name\NWSCDC2
    Starting test: Connectivity
    * Active Directory LDAP Services Check
    * Active Directory RPC Services Check
    ......................... NWSCDC2 passed test Connectivity

    Doing primary tests

    Testing server: Default-First-Site-Name\NWSCDC
    Starting test: Replications
    * Replications Check
    * Replication Latency Check
    DC=ForestDnsZones,DC=nwsc,DC=co,DC=ug
    Latency information for 4 entries in the vector were ignored.
    4 were retired Invocations. 0 were either: read-only
    replicas and are not verifiably latent, or dc's no longer replicating this
    nc. 0 had no latency information (Win2K DC).
    DC=DomainDnsZones,DC=nwsc,DC=co,DC=ug
    Latency information for 4 entries in the vector were ignored.
    4 were retired Invocations. 0 were either: read-only
    replicas and are not verifiably latent, or dc's no longer replicating this
    nc. 0 had no latency information (Win2K DC).
    CN=Schema,CN=Configuration,DC=nwsc,DC=co,DC=ug
    Latency information for 9 entries in the vector were ignored.
    9 were retired Invocations. 0 were either: read-only
    replicas and are not verifiably latent, or dc's no longer replicating this
    nc. 0 had no latency information (Win2K DC).
    CN=Configuration,DC=nwsc,DC=co,DC=ug
    Latency information for 9 entries in the vector were ignored.
    9 were retired Invocations. 0 were either: read-only
    replicas and are not verifiably latent, or dc's no longer replicating this
    nc. 0 had no latency information (Win2K DC).
    DC=nwsc,DC=co,DC=ug
    Latency information for 8 entries in the vector were ignored.
    8 were retired Invocations. 0 were either: read-only
    replicas and are not verifiably latent, or dc's no longer replicating this
    nc. 0 had no latency information (Win2K DC).

    Can anyone please help

  2. #2
    Join Date
    Jan 2006
    Posts
    3,792
    Could you please post the ipconfig /all from all the DC and DNS servers. Have you checked if a firewall is running on the DCs or not? Have you tried to change anything before this happened? Or the issue comes after addming a new DC or so? Let us also know how many sites do you have with you?

  3. #3
    Join Date
    Feb 2006
    Posts
    335
    Can you check that your DCs have in total the 5 FSMO roles. Since you are talking about an old crashed DCs, are there any entries in AD or DNS from that machine? Thanks.

  4. #4
    Join Date
    Sep 2009
    Posts
    1
    Have you got any solution,
    if yes

    please provide me i am also facing same poblem,

    this problem realted to Global catalog server.

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