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mdaehlmann's avatar
mdaehlmann
Copper Contributor
May 05, 2021

Latest LCU not detected from WSUS if corresponding SSU preinstalled

Hi, for a few months now, the SSU is bundled with the LCU. I have noticed that, if the bundled SSU is manually preinstalled with e.g. DISM, the corresponding LCU portion will no longer be detected...
LCU
SSU
windows 10
Windows Update
WSUS
mdaehlmann's avatar
mdaehlmann
Copper Contributor
May 12, 2021

It got worse with this May's Patch Tuesday.

 

Now, when only the SSU portion of the 2021-05 Cumulative Update is installed manually, the LCU package is in fact offered by WSUS!


However, the client won't install anything. It will show the "2020-05 Cumulative Update" as installed in the update history, suggesting to the user that everything is fine. After a reboot, "system info" reveals that we're still on version 10.0.19042.631 from last November. This is really bad...

 

Regards,
Markus

  • mdaehlmann's avatar
    mdaehlmann
    Copper Contributor
    Oct 15, 2021

    For anyone else having this issue: This seems to be caused by having express update files enabled in WSUS. After disabling them (and losing some hair over how to correctly purge the related files and metadata from WSUS and how to make the clients not want to still download them), this issue went away.

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