After rebooting a node or nodes of a Hyper-V CSV used for agentless protection, backups start to fail for virtual machines with one or more errors:
System.AggregateException: One or more errors occurred. ---> Replay.Agent.Contracts.Transfer.TransferFailedException: The transfer failed: 'Call to service method https://HVCSVNodex:8006/apprecovery/api/agent/hypervMachineTransfer/snapshotsHyperv POST failed: The method ModifySystemSettings call failed with error: Invalid state for this operation.' ---> System.AggregateException: One or more errors occurred. ---> WCFClientBase.ClientServerErrorException: Call to service method https://HVCSVNodex:8006/apprecovery/api/agent/hypervMachineTransfer/snapshotsHyperv POST failed: The method ModifySystemSettings call failed with error: Invalid state for this operation. ---> System.Management.ManagementException: The method ModifySystemSettings call failed with error: Invalid state for this operation.
System.AggregateException: One or more errors occurred. ---> WCFClientBase.ClientServerErrorException: Call to service method https://HVCSVNodex:8006/apprecovery/api/agent/hypervFileProtection/resumeProtection POST failed: File protection failed. Looks like the file with id: DriverFileId: 50, VolumeSerialNumber: 11424014480216980147, FileIdHighPart: 281474976713596, FileIdLowPart: 0 is not protected. ---> System.InvalidOperationException: File protection failed. Looks like the file with id: DriverFileId: 50, VolumeSerialNumber: 11424014480216980147, FileIdHighPart: 281474976713596, FileIdLowPart: 0 is not protected. ---> System.ComponentModel.Win32Exception: Element not found.
System.AggregateException: One or more errors occurred. ---> WCFClientBase.ClientServerErrorException: Call to service method https://HVCSVNodex:8006/apprecovery/api/agent/hypervMachineTransfer/clearBitmaps/950c5e31-3f07-44be-93ba-4e6fb4385cf6/ POST failed: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
If this does not resolve your issue, please open a service request with Support for further investigation.
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