Hello,
I think there might be an issue with downstream servers in server wsus 2019.
First I did update my main WSUS to 2019. All Downstream were 2016. After that I was not able to view the complete computer list on the main server. As soon as you choose the “All Computers” or a computer group that is from a downstream server the console crashes. When you delete the downstream server from the “Downstream Servers” section I am able to browse the list again.
After that I decided to reinstall all WSUS Servers with server 2019 even including the main one. And I did again get the error.
Tried it via Powershell gives me the following error.
$wsusserver = "localhost"
[reflection.assembly]::LoadWithPartialName("Microsoft.UpdateServices.Administration")
$wsus = [Microsoft.UpdateServices.Administration.AdminProxy]::getUpdateServer($wsusserver,$False)
$computerScope = New-object Microsoft.UpdateServices.Administration.ComputerTargetScope
$computerScope.IncludeDownstreamComputerTargets = $true
$wsus.GetComputerTargets($computerScope)Exception calling "GetComputerTargets" with "1" argument(s):"Unable to cast object of type 'System.Guid' to type 'System.String'."
At line:1 char:1
If I choose to not include Downstream Computer Targets it works.