When attempting a backup, vRanger cannot take a snapshot and the job fails.
Virtual Machine is not correctly seen in Virtual Center
Navigate to vSphere Client, verify if a snapshot can be taken.
If not, restart managements agents on the host.
Ensure Automatic Startup/Shutdown of virtual machines is disabled before running this command or you risk rebooting the virtual machines.
Log in to your ESX host as root from either an SSH session or directly from the console.
Type service mgmt-vmware restart.