Unable to enter maintenace mode periodically

##### ISSUE TYPE

* Bug Report

##### COMPONENT NAME

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Maintenance Mode
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##### CLOUDSTACK VERSION

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4.19.1.0
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##### CONFIGURATION

Advanced Networking
Three KVM Hosts, two of the three hosts run the management servers and database (master/replica).

##### OS / ENVIRONMENT

Ubuntu 22.04

##### SUMMARY

When attempting to put hosts into maintenance mode, some instances migrate, but some still remain on the host until it reaches ErrorInMaintenance. When looking at the agent logs on the host that is being vacated, there appears to be no interaction it receives from the management server during these times when an instance is having issues migrating.

Management Server Log snippet:


##### STEPS TO REPRODUCE

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1. Enter a host into maintenance mode
2. Wait for status to change into a permanent state.
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##### EXPECTED RESULTS

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Host enters into maintenance.
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##### ACTUAL RESULTS

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Host enters into ErrorInMaintenance.
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El payload no menciona archivos fuente ni pruebas; comienza con el workflow de Maintenance Mode y reprodúcelo en la configuración descrita de tres hosts con networking avanzado. Compara los logs del management-server y del agent cuando las instancias permanecen en el host, y considera terminado el trabajo cuando el host alcance maintenance en lugar de ErrorInMaintenance.

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