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charlie4872's avatar
charlie4872
Brass Contributor
Sep 01, 2022

Get Logon Server From List Of Computers

Hello I am trying to find the logon server $env:logonserver from a list of computers in a .txt file and have the results exported out to a .csv file for a domain migration project I am working on.  I...
Windows PowerShell
Windows Server
farismalaeb's avatar
farismalaeb
Iron Contributor
Sep 02, 2022

charlie4872 

You dont need to use the variable before the foreach.

Use this.

$computers = get-content C:\MyFile.txt
 foreach ($computer in $computers){
$results=invoke-command -computer $computer -scriptblock {$env:logonserver}
Add-Content C:\MyResult.txt -Value $results 
}
charlie4872's avatar
charlie4872
Brass Contributor
Sep 02, 2022
Thanks for the reply Farismalaeb. I mad the changes you suggested and it returned no results. The .txt file is empty. My goal is to have it output a .csv file with two columns.

Computername Logonserver

For each of the computers in the computers.txt file.
  • LainRobertson's avatar
    LainRobertson
    Silver Contributor
    Sep 02, 2022

    charlie4872 

     

    Taking a quick look, the LogonServer environment variable only seems to be set for Interactive (logonType = 2, or 10 in the case of RDP for the RemoteTerminal logonType.)

     

    Running remote commands will use the Network logon (logonType = 3), and not all logon processes are executed in this scenario. This impacts the session environment variables created, with some like LogonServer not being created.

     

    If you run the following command, you'll find that LogonServer isn't listed.

     

     

    Invoke-Command -ComputerName somecomputer.yourdomain.com -ScriptBlock {
    $ev = [System.Environment]::GetEnvironmentVariables();
    $ev.Keys |
        ForEach-Object {
            [PSCustomObject] @{
                Variable = $_;
                Value = $ev[$_];
            }
        }
    } |
        Sort-Object -Property Variable |
            Format-Table -AutoSize PSComputerName, Variable, Value;

     

     

    Cheers,

    Lain

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