When accessing backup files on a CIFS (SMB) repository, Veeam Backup and Replication reports either of the following errors:
The specified network name is no longer available. (code 59, 0x8007003B)
An unexpected network error occurred. (code 64, 0x80070040)
Veeam Backup & Replication uses SMB connections for backup repositories, guest processing, and when first adding a Windows server to the Backup Infrastructure. This KB only addresses error messages that occur in the context of a backup file path, such as:
The specified network name is no longer available. Failed to read data from the file [\\10.0.0.81\backups\SQL VM New\SQL VM New2015-09-23T200441.vbk].
Note: If the failure is occurring in a tape job and no UNC path is specified in the error message, please contact Veeam Support.