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Snapshot issue (Build 9010)

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After upgrading to Build 9010, I am getting errors on my VM backups:

Activity 'Creating application-consistent (VSS) snapshot failed.  Unable to communicate with the remote host since it is disconnected.

These are scheduled to run overnight.  When I launch them manually the next day, I can usually get the backup completed.

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Hello RG,

The above message usually means that the ESX\ESXi server hosting the VMs in question is disconnected and inaccessible from the vCenter server. Have you checked the logs of vCenter? Are there any messages related to the state of ESX\ESXi servers at the moment when backup should be running. If you see any evidence of the servers being not responsive\disconnected, I'd recommend starting the troubleshooting with https://kb.vmware.com/s/article/1003409