If that file doesn't exist on the engine VM, then you might want to try
checking the RPM database on that VM and make that sure you don't have
broken packages. Run $dnf check and $rpm --verify -a
That should give you a list of what packages are broken and what files
are missing / corrupted. You can then reinstall the affected packages.

The CA used by noVNC is the engine's internal CA. Regardless as to what
apache is set to use on the engine host. Your paid CA cert is
irrelevant here.
Longer explanation: The VNC connection originates from the hypervisor
host running the target VM, not the engine VM itself. Essentially,
noVNC is a web app that was pulled into the browser using a connection
secured by your paid CA, then the web app established a new connection
to a different server (the hypervisor host) using a different CA (the
engine's internal CA).

-Patrick Hibbs

On Mon, 2022-10-03 at 20:47 +0200, Jirka Simon wrote:
> Ahoj Michale,
> 
> I tried it and the result is the same.  Message in engine log is
> strange file really doesn't exists '/usr/share/ovirt-
> engine/files/novnc/vendor/promise.js on the engone VM.
> 
> Certificate we use is valid with payed  CA and its CA is in any
> browser by default. Maybe there can be something wrong when i changed
> default certificate to the custom one. But before today's morning
> upgrade everything worked fine.
> 
> let me check this. 
> 
> 
> Thank you 
> Jirka
> 
> On 10/3/22 14:24, Michal Skrivanek wrote:
> 
> > There's been no interesting change between these versions. I would
> > rather suspect certificates...can you try in brand new browser
> > sessions and make sure the engine CA is imported? 
> > 
> > 
> > 
> > > On 3. 10. 2022, at 13:40, Jirka Simon <[email protected]> wrote:
> > > 
> > > 
> > > Hello there, 
> > > after update from 4.5.2.4 to 4.5.2.5  stopped to work noVNC
> > > client within browser,  it writes  Something went wrong,
> > > connection is closed in browser and then i th engine log is this
> > > message.
> > > 2022-10-03 13:34:55,772+02 INFO
> > >  [org.ovirt.engine.core.utils.servlet.ServletUtils] (default
> > > task-13) [] Can't read file '/usr/share/ovirt-
> > > engine/files/novnc/vendor/promise.js' for request '/ovirt-
> > > engine/services/files/novnc/vendor/promise.js' -- 404
> > > thank k you for any advice.
> > > 
> > > Jirka
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> > 
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