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When accessing backup files on a CIFS (SMB) repository, Veeam Backup & 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.
Consider the following:
The following registry values are intended for scenarios where no alternative protocol can be used to communicate with the NAS.
(No possibility of switching to NFS, which is far more stable and tolerant of poor network connections.)
These registry values must be created on the SMB gateway, specified in the repository settings as the Gateway server. For short-term testing, it is advisable to manually assign a single machine as the gateway and make modifications to that machine. When the gateway is set to “automatic,” these registry values would have to be added to all Windows machines managed by Veeam Backup & Replication, as any of them could be selected to act as the gateway.
NetUseShareAccess
This registry value controls whether the Veeam Data Movers will access backup files using a method similar to the Windows net use command.
Key Location: HKLM\SOFTWARE\Veeam\Veeam Backup and Replication\
Value Name: NetUseShareAccess
Value Type: DWORD (32-Bit) Value
Value Data(Default): 0
Set to 1 to enable net use.
Note: When NetUseShareAcces is enabled, if credentials are required to connect the SMB share, they must be specified as Domain\User or Host\User in the repository settings. .\User credentials are not supported with NetUseShareAccess.
For example, specify “NAS-01\Admin” instead of “.\Admin”.
SessTimeout
This registry value sets the amount of time the Windows SMB client will wait for a response from an SMB server before it aborts the connection.
Note: Reboot Required
Key Location: HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\
Value Name: SessTimeout
Value Type: DWORD (32-Bit) Value
Value Data(Dec): 60
Note: The default timeout is 60 seconds; try increasing the timeout to 600 seconds (10 minutes).
The current value can be checked using the following PowerShell command:
(Get-SmbClientConfiguration).SessionTimeout
TcpMaxDataRetransmissions
This Windows-level registry value sets the number of times the Windows TCP implementation will retransmit a data segment before it aborts the connection.
Note: Reboot Required
Key Location: HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
Value Name: TcpMaxDataRetransmissions
Value Type: DWORD (32-Bit) Value
Value Data(Dec): 5
The default value is 5 retransmissions, try doubling the number of retransmissions to 10.
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