r/sysadmin • u/Frossstbiite • 2h 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/OinkyConfidence Windows Admin 54m ago

I mean, WSUS was deprecated back in September 2024, so I'm not surprised it is acting up. WUfB/Autopatch/Intune might be in your future.

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u/Frossstbiite 54m ago

Ah I didnt know that. Thanks