vProxy: Unable to Select a Device from the Client's 'backup target disks' Attribute

The NetWorker VMware Protection integration is configured with the vProxy Appliance. The Microsoft VM App Agent for SQL Server application-consistent protection was configured using the Advanced Application Consistency backup action option.

Figure 1: VM backup action configuration settings for SQL server protection

The backup action fails to complete successfully:

MM/DD/YYYY HH:MM:SS Action backup vmware-vproxy 'Backup' has initialized as 'vproxysave job' with job id 1984042
MM/DD/YYYY HH:MM:SS Calling the nsrvim program to collect the inventory data.
MM/DD/YYYY HH:MM:SS Setting default timeout 1800.
MM/DD/YYYY HH:MM:SS Using a timeout of 1800 seconds for the nsrvim request. Minimum timeout is 360 seconds. Maximum timeout is 3600 seconds.
MM/DD/YYYY HH:MM:SS Total number of static VM's selected: 1.
MM/DD/YYYY HH:MM:SS Total number of merged VM's obtained from static and dynamic association: 1.
MM/DD/YYYY HH:MM:SS Unable to process VM 'SQL01.lab.local': Unable to select a device from the client's 'backup target disks' attribute. All backup target disks for client 'vcenter.lab.local' are either not available or not mounted
MM/DD/YYYY HH:MM:SS SQL01.lab.local: Backup failed.
MM/DD/YYYY HH:MM:SS Final Summary of VMs:
MM/DD/YYYY HH:MM:SS   0 canceled backups
6MM/DD/YYYY HH:MM:SS   1 failed backups

The "SQL Server VSS Writer" service is not running on the target SQL virtual machine.

Start the "SQL Server VSS Writer" service on the target SQL virtual machine.