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SCS KB 1105: Backup fails with "Windows error: (0x80070544) The validation information class requested was invalid

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Symptoms:

Backup to NAS or a different activity(replication, validation) fails with:

 Windows error: (0x80070544) The validation information class requested was invalid

Example of error log: click to expand

Error code: 37
Module: 4
LineInfo: 0xD20E543A9A9BC2FD
Fields: {"$module":"disk_bundle_vsa64_16363"}
Message: Invalid file handle.
------------------------
Error code: 65520
Module: 0
LineInfo: 0xBD28FDBD64EDB8F8
Fields: {"code":"2147943748","$module":"disk_bundle_vsa64_16363"}
Message: The validation information class requested was invalid

Root Cause:

The share cannot be mounted from a particular Windows machine using the supplied credentials.

Solution:

The username should be specified in hostname\username format, i.e. have target server name prefix. E.g if NAS name is BackupStorage and your username on that NAS is backupadmin, use Backupstorage\backupadmin as the username.  

In case providing credentials in the specified format does not help, try accessing the same share using native Windows Explorer (from Windows machine which you try to backup) - this would help to troubleshoot the issue and find the proper username format.

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