NetWorker: Azure VM Snapshot Restore Fails "Could not resolve host STORAGE_ACCOUNT.blob.core.windows.net"

Summary: NetWorker Azure Virtual Machine (VM) Snapshot restore fails, reporting a name resolution error when connecting to the blob storage account.

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Symptoms

Azure VMs are protected using NetWorker Azure VM snapshot protection.
An Azure VM snapshot restore fails with the following error in the recover log:

207705:nsrazure_recover: Curl: Error setting options/performing in curl, error details: Couldn't resolve host name(curl error code: 6), Could not resolve host: STORAGE_ACCOUNT_NAME.blob.core.windows.net
207849:nsrazure_recover: Failed createEmptyBlob...

This problem can appear on a long-running restore session. 
There are no name resolution errors observed while using nslookup or curl against the Azure blob storage account:

nslookup STORAGE_ACCOUNT_NAME.blob.core.windows.net
curl -k https://STORAGE_ACCOUNT_NAME.blob.core.windows.net

Cause

This issue was raised to NetWorker engineering.

Impacted Versions:

19.11.x
19.12.0.0 -> 19.12.0.2
19.13.0.0

Resolution

This issue is fixed in the following NetWorker versions:

  • 19.13.0.1
  • 19.12.0.3

Workaround:

Add the Azure blob storage endpoint to the NetWorker servers local hosts file:

Linux: /etc/hosts
Windows: C:\Windows\System32\drivers\etc

This change bypasses potential transient Domain Name System (DNS) resolution errors.

NOTE: In some scenarios, other connection errors may still be observed; for example "connection reset by peer." A solution will be delivered through code changes to nsrazure_recover.

Affected Products

NetWorker

Products

NetWorker Family
Article Properties
Article Number: 000339177
Article Type: Solution
Last Modified: 30 Oct 2025
Version:  8
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