Sometimes the DR backup may fail with following error:

DR Image Backup Failure: redstone.xmlrpc.XmlRpcException: A network error occurred.
BeforeJob: A failure has occurred, Job is terminating.
* VimSdk component failed on the agent machine. Win32 error: 0x00000064 The specified network name is no longer available.

This errors usually indicates an unstable connection between the client-server and the CFA when backup attempts to be uploaded onto the SMB share on the CFA. In most of the cases that issue is caused by the SMB1 protocol that is used on the client, which proved to be unreliable and not secure. In order to fix this, we are suggesting to disable the SMB1 protocol, which can be done by following these guide lines:

https://support.microsoft.com/en-us/help/2696547/how-to-detect-enable-and-disable-smbv1-smbv2-and-smbv3-in-windows-and

You can also try using [this](https://secure.filelocker.com/shared/d9KlusIfkqhZ0I3WqudX9AOGYbD97hBcjEVgtSFE8lw){:target=\_blank} PowerShell script.