PowerShell | Get Storage from Servers with "Get-ADComputer" - windows

Question

i have an problem with my script, plz help :3
This script is supposed to get all Server Hostnames from our Server OU. And than get the Used and Free Space of the Servers But when i try to get the server list with the "Get-AdComputer" cmdlet i get errors.
$servers = Get-ADComputer -Filter * -SearchBase "OU=SomeOU, DC=SomeDomain, DC=SomeDomain, DC=SomeDomain" | Select-Object Name
$allDisks = foreach ($server in $servers)
{
Get-WmiObject Win32_LogicalDisk -ComputerName $server -Filter DriveType=3 |
Select-Object #{'Name'='ComputerName'; 'Expression'={$server}},
DeviceID,
#{'Name'='Size'; 'Expression'={[math]::truncate($_.size / 1GB)}},
#{'Name'='Freespace'; 'Expression'={[math]::truncate($_.freespace / 1GB)}}
}
$allDisks |Export-Csv C:\Servers.csv -NoTypeInformation
when i run this i get:
Get-WmiObject : Der RPC-Server ist nicht verfügbar.
In Zeile:5 Zeichen:5
+ Get-WmiObject Win32_LogicalDisk -ComputerName $server -Filter Dri ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [Get-WmiObject], COMException
+ FullyQualifiedErrorId : GetWMICOMException,Microsoft.PowerShell.Commands.GetWmiObjectCommand
i also should add, that if i only run the thing from the first line i get an clean list of all of our servers.

Answer 1

As the error states that RPC server is not available for the one of the servers that you are trying to query. There can be multiple reasons as per the PS Blog:
The remote computer is blocked by the firewall.
Solution: Open the Group Policy Object Editor snap-in (gpedit.msc) to edit the Group Policy object (GPO) that is used to manage Windows Firewall settings in your organization. OpenComputer Configuration, open Administrative Templates, open Network, open Network Connections, open Windows Firewall, and then open either Domain Profile or Standard Profile, depending on which profile you want to configure. Enable the following exception: “Allow Remote Administration Exception” and “Allow File and Printer Sharing Exception“.
Hostname or IP address is wrong or the remote computer is shut down.
Solution: Verify correct hostname or IP address.
The “TCP/IP NetBIOS Helper” service isn’t running.
Solution: Verify that “TCP/IP NetBIOS Helper” is running and set to auto start after restart.
The “Remote Procedure Call (RPC)” service is not running on the remote computer.
Solution: Verify that “Remote Procedure Call (RPC)” is running and set to auto start after restart.
The “Windows Management Instrumentation” service is not running on the remote computer.
Solution: Verify that “Windows Management Instrumentation” is running and set to auto start after restart
So, I dont think there is any code issue there. Kindly check the network firwwall and server side. Also apply a try/catch block and capture the exact server name in the loop to see which server is that causing the issue.