Recurring WUA error: Invalid Variant Type

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t.heroult
Messages: 307
Registration: December 8, 2020 - 10:13 AM

May 15, 2026 - 2:54 PM

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?
Server: WAPT Enterprise 2.6.1.17786 on Debian
Consoles: Windows 10 & 11
Infrastructure: Windows

Did you know? When parrotfish undergo smoltification, their osmoregulation mechanism is reversed!
sleguevel
Messages: 5
Registration: Oct 31, 2024 - 4:02 p.m.

May 26, 2026 - 4:44 PM

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.
gadam
Messages: 23
Registration: Oct 30, 2025 - 2:46 p.m.

May 27, 2026 - 3:07 PM

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
sleguevel
Messages: 5
Registration: Oct 31, 2024 - 4:02 p.m.

May 27, 2026 - 3:40 PM

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.
sleguevel
Messages: 5
Registration: Oct 31, 2024 - 4:02 p.m.

May 28, 2026 - 11:32

Hello,

have you made any progress in your investigations?

Thank you in advance for your help.
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