VM console cannot access after VNC certificate expired

##### ISSUE TYPE

* Bug Report

##### COMPONENT NAME

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CPVM
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##### CLOUDSTACK VERSION

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4.18
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##### CONFIGURATION

advanced networking

##### OS / ENVIRONMENT

Hypervisro: KVM virtualization with ubuntu 22.04

##### SUMMARY

VM console cannot access after VNC certificate expired。
Default certificate valid for 1 year ，then automatically renews certificates when they expire by cloudstack。
I made sure the certificate was updated on the host，but Th running VM instances need stop and start to apply the new certificate or migraton to other host. For production environments, this is hard to do

I don't know how to get a new certificate to take effect without rebooting the vm

https://github.com/apache/cloudstack/pull/7015

##### STEPS TO REPRODUCE

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##### EXPECTED RESULTS

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Make a new certificate to take effect without rebooting the vm
Provide a setting to turn off tls for vnc
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##### ACTUAL RESULTS

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Comienza con el flujo de renovación de certificados de CPVM y VNC descrito en el issue, y después revisa el pull request enlazado #7015 y la discusión reciente. Reproduce el caso de un certificado caducado en CloudStack 4.18 con KVM y Ubuntu 22.04; se considera terminado cuando un certificado renovado se aplica a las VMs en ejecución sin detenerlas, iniciarlas ni migrarlas.

Escrito por el modelo de indexación a partir del texto del issue.