Error: "Cryptographic Services failed while processing the OnIdentity() call in the System Writer Object"
The error might be reported during backup (sets using VSS) in the operating system event viewer, application log (backup source computer).
This issue occurs because VSS System Writer does not have permission to read the NT AUTHORITY\SERVICE (service account). When System Writer runs as a cryptographic service and tries to read the Mslldp.sys information from a Microsoft Link-Layer Discovery Protocol driver, the "access denied" error is generated.
The error can be safely ignored, in order to prevent it being reported and for more details, please check the link below: