Rudder

Agent looks for FQDN using the following methods

(Get-WmiObject -class Win32_ComputerSystem).DNSHostName

    my $getComputerName = Win32::API->new(
        "kernel32", "GetComputerNameExW", ["I", "P", "P"], "N" 
    );

 $ENV(COMPUTERNAME)

but these methods don't seem to return the FQDN if it's set locally, not via the domain controller

it seems* a more reliable approach is to use

[System.Net.Dns]::GetHostByName($env:computerName).HostName