Page 1 of 1

Recurring WUA error: Invalid Variant Type

Published: May 15, 2026 - 2:54 PM
by t.heroult
For several weeks now (even with the latest version), I've occasionally been getting "Invalid Variant Type" errors after installing WUA on Windows 11 24h2 machines.

Any idea what could be causing this?

Re: Recurring WUA error: Invalid Variant Type

Published: May 26, 2026 - 4:44 PM
by sleguevel
Hello,

I'm following up on this topic because two of our servers are also getting an "Invalid Variant type" error on WUA and are unable to install the pending May updates.
Note that these are the only two servers with the WAPT administration console.

Thank you for your help.

Re: Recurring WUA error: Invalid Variant Type

Published: May 27, 2026 - 3:07 PM
by gadam
Hello t.heroult.

I tried calling you without success. Could you please try installing the package https://wapt.tranquil.it/store/fr/tis-c ... stribution on the affected machines? Also, have you noticed any commonality among the affected machines? Are they always the same ones?

I haven't detected anything unusual on the infrastructure of sleguevel, who replied to the post. The installation of tis-clean-softwaredistribution is underway there, and we are awaiting their feedback.

We are also investigating on our end.

Best regards

Re: Recurring WUA error: Invalid Variant Type

Published: May 27, 2026 - 3:40 PM
by sleguevel
Good morning,

Here is my feedback:
  • Server 1: Scan: ERROR -> Restart -> Scan: ERROR
  • Server 2: Clean-Softwaredistribution package: OK -> Scan: ERROR -> Restart -> Scan: ERROR
Thank you for your investigation, please feel free to call for remote access to our servers if needed.

Re: Recurring WUA error: Invalid Variant Type

Published: May 28, 2026 - 11:32
by sleguevel
Hello,

have you made any progress in your investigations?

Thank you in advance for your help.