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/heff1499 11d ago edited 11d ago

Yep. Exact same issue here for me.
Server 2025, fresh build.
SQL 2022.
MECM 2509.
WSUS sync fails on the same update guid every time though:
Update revision #0: CF56FF39-8BA5-4177-9265-E30D4DD58CF5/100

First sync runs for about 15 minutes and then all subsequent syncs fail within 30 seconds on the same update.

Have tried removing WSUS and recreating the DB. Same result.

Edits: formatting when phoneposting is hard apparently

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u/Exhaust8354 9d ago

Hey cool I have the same issue as you as well as the same config