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Backup to Data Domain fails with “Error: calling system(), returns nonzero. Err: 5040 Failed to connect to storage.”


When preparing storage for backup you receive the following error message: "Error: calling system(), returns nonzero. Err: 5040 Failed to connect to storage"


The Data Domain chooses to use a different NIC than configured. Veeam is unable to communicate with the appliance as a result.
This is visible in the job logs:
Info     Preparing storage '[REDACTED].vbk' for write. Is optimized for de-duplication media 'False'.
Info     [AP] (9150) command: 'prepStorageForWriteEx\nddboost://[REDACTED].vbk\n8192\n0\n'
Info     [AP] (9150) error: calling system(), returns nonzero. Err: 5040


Re-add the repository to Veeam Backup and Replication with the production network IP address.

More information

EMC has documentation on this error message, though it does not pertain directly to Veeam; see below. For more in-depth assistance when troubleshooting this issue, it is recommended to contact EMC support.
Veeam Backup & Replication
8.x, 9.x
Last Modified:
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