Dell Unity: Unable to refresh managed server %2 because of an internal issue

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CRITICAL An internal issue has occurred.
Retry the operation. If the problem persists, contact your service provider.
Unable to refresh managed server %2 because of an internal issue.

Dell Unity performs regular polling request against vCenter/ESXi-Hosts to retrieve host information.

If the polling operation could not be completed, (timed out) results in the error "ALRT_HOST_ERROR."

There can be multiple reasons for the host information not being retrieved either any or all the host were busy with some other ongoing operations or there could be any connection issue in the management network between Dell Unity and ESXi-Hosts during the poll.

The Management Server may be stopped responding. Use the following KB Article 490488 Dell Unity: How to restart the Management Services.

The poll occurs every 60 minutes. If the next request is completed successfully, the error will be cleared:

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Host %2 is operating normally.

If the ESXi-Host is not reachable over the management network by start of the polling request, the following event is logged:

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Unable to refresh managed server %2 because of a connection issue.