I receive a "Status Code: 500" popup whenever I attempt to create a snapshot 
for a Windows VM from the Administration Portal UI. It doesn't matter if the VM 
is powered on or off. Nor the OS designation set in the UI (setting Linux or 
Other...).

The modal usually states: "Operation Canceled" followed by "Error while 
executing action: A Request to the Server failed with the following Status 
Code: 500" or "Error while executing query: null". There are at least a dozen 
popups, and will continue to repeat every few seconds.

The snapshot tab in the Admin Portal UI will then have issues displaying the 
Active VM and the newly created snapshot entry. If you try to examine both 
entries, the disk, network, and installed applications might appear blank.

The web inspector will usually contain the following:

Fri Dec 22 09:43:07 GMT-500 2023 org.ovirt.engine.ui.frontend.Frontend
SEVERE: Failed to execute runQuery: 
com.google.gwt.user.client.rpc.StatusCodeException: 500 Internal Server Error 
The call failed on the server; see server log for details
com.google.gwt.user.client.rpc.StatusCodeException: 500 Internal Server Error 
The call failed on the server; see server log for details

The engine logs will have:

File: server.log

2023-12-22 09:43:04,387-05 ERROR [io.undertow.servlet] (default task-726) 
Exception while dispatching incoming RPC call: 
com.google.gwt.user.client.rpc.SerializationException: Can't find the 
serialization policy file. This probably means that the user has an old version 
of the application loaded in the browser. To solve the issue the user needs to 
close the browser and open it again, so that the application is reloaded.
... snip ...
Caused by: com.google.gwt.user.client.rpc.SerializationException: Type 
'org.ovirt.engine.core.common.utils.SecretValue' was not included in the set of 
types which can be serialized by this SerializationPolicy or its Class object 
could not be loaded. For security purposes, this type will not be serialized.: 
instance = ***

The same snapshot will appear fine in the VM Portal. I am able to see the 
network interfaces, and disks.

No issues creating a snapshot of a Linux-based VM from either UI interfaces.

I've tried in both Firefox (115.5 ESR) and Google Chrome (latest-ish).

Any thoughts on where to look next?

Version 4.5.6-0 (git12af746179.el8) on RHEL 8.

Thank you,

Jon
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