GitHub user damien-kamerman closed a discussion: Not able to attach iso - "is
not a valid QCOW2"
Hi,
I'm not able to attach an iso to a KVM instance. The error is 'The downloaded
file is not a valid QCOW2.'. It's definitely an iso and not a template so not
sure why it's checking for QCOW2.
GitHub user weizhouapache closed the discussion with a comment: Not able to
attach iso - "is not a valid QCOW2"
Fixed by #11532
GitHub link:
https://github.com/apache/cloudstack/discussions/11515#discussioncomment-14263570
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GitHub user weizhouapache added a comment to the discussion: [HTTP ERROR 503
Service Unavailable]
> I have the same error. I installed version: `4.20.1.0` today without any
> modification. After that i made the upgrade to: `4.21.0.0`:
>
> ``` 2025-08-29 10:03:41,882 WARN [c.c.u.d.T.Transacti
