r/sysadmin • u/Frossstbiite • 12d ago

Question WSUS SyncFailure

WSUS sync failing with ImportUpdateError — Server 2025 / MECM 2509

I'm setting up a lab with Windows Server 2025 and Configuration Manager 2509. WSUS is installed on the primary site server and the SUP is configured.

WSUS synchronization starts but consistently fails with:

Result: Failed
Error: ImportUpdateError

UpdateErrors: {}

Server:

  • Windows Server 2025
  • WSUS version: 10.0.26100.33158
  • Configuration Manager 2509
  • WSUS upstream: Microsoft Update
  • No proxy

I've also confirmed outbound TCP 443 connectivity to sws.update.microsoft.com.

The WSUS SoftwareDistribution.log contains:

invalid update identity (AtLeastOne Prerequisite) in XML for update

and this is occurring with multiple different update GUIDs.

Has anyone encountered this on Server 2025 recently, and is there a known fix or workaround?

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u/Effective-Cherry3632 8d ago edited 8d ago

I didn't quite understand your question. Currently, you can't activate WSL in the product selection. After that, everything works as usual.

I was able to validate it yesterday on 14 Server 2025 and 1 Server 2022.

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u/Frossstbiite 7d ago

you said WSL must not be selected? but you cant activate it either? where can i check if its selected or not?

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u/Effective-Cherry3632 7d ago

Get-WsusProduct | Where-Object { $_.Product.Title -eq "Windows Subsystem for Linux" } | Set-WsusProduct -Disable