A VADP backup cannot create a VM snapshot and fails with the error: "StartBackupSession failed. error: Create snapshot task failed: The operation has been disabled by the guest operating system (VixDiskLib_PrepareForAccess returned error code: 20005) An error occurred while saving the snapshot: Exceeded the maximum number of permitted snapshots. Failed OpenListing for..."
The special parameter " " for a Virtual Machine is configured to NOT allow a snapshot creation.
To re-configure the special parameter " " for a Virtual Machine to allow snapshots creation, please use following steps:
Please also refer to the VMware KB#1031280.