Querying GC for same -identity

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This topic contains 5 replies, has 4 voices, and was last updated by

2 years, 2 months ago.

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  • #55462

    Points: 71
    Rank: Member

    I am trying to understand why when I query any given GC, I only return 1 instance of a user object for which I know there are 3 or more.

    Get-ADUser -Identity admin_User -Credential $creds -Server company.com:3268

    Depending on what -server parameter I choose (they are all Global Catalogs btw) I only retrieve that particular domains' instance of the -identity.

    How can I use PS to query for all objects in all child domains using the global catalog?


  • #55475

    Points: 1,785
    Helping HandTeam Member
    Rank: Community Hero

    Get-ADUser doesn't necessarily query the GC; it's designed to query the entire user object, and so it contacts a DC. Obviously, on a given DC, there can only be one instance of a given user. What's in the GC isn't technically a user object, which is what Get-ADUser wants to query.

    You might be better off shifting to an older-style ADSI query, where you can explicitly query a GC.

  • #55687

    Points: 21
    Rank: Member

    (get-adforest).domains | % { get-aduser -Server $_ -filter *}

    • #55843

      Points: 71
      Rank: Member


      I actually meant "How can I use PS to query for instances of a specific User in all child domains using the global catalog?"

      I've tried adding an -identity param in your example but not working:

      (get-adforest).domains | % { get-aduser -Identity ThisUser -Server $_ -filter *}
  • #55871

    Points: 21
    Rank: Member

    You can't use the filter when supplying identity.

  • #55882

    Points: 38
    Rank: Member

    Identity can be a DN, a GUID, a SID or a sAMAccountName.

    As the sAMAccountName is the only one of those that could be the same across the various domains, you're better off providing a filter based on that. This will return the correct results:

    PS C:\Users\Administrator> Get-ADUser -Filter 'sAMAccountName -eq "john.smith"' -server contoso.com:3268 -searchbase 'DC
    =Contoso,DC=com' | Select-Object sAMAccountName, UserPrincipalName
    sAMAccountName                                              UserPrincipalName
    --------------                                              -----------------
    John.Smith                                                  John.Smith@contoso.com
    John.Smith                                                  John.Smith@child.contoso.com

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