Azure Backup Server: SQL 2016 AlwaysOn protection fails with Internal error code 0x80990F75

3:54 pm in 0x80990F75, Azure, Azure Backup, Azure Backup Server, Microsoft Azure Backup Server, Microsoft Azure Backup Server v2, SQL Always On Availability Groups, SQL Server 2016 by Wim Matthyssen

While setting up a new backup job to protect a SQL Server 2016 AlwaysOn Availability Group (AG) using Azure Backup Server (MABS), the job failed and ended up with the Protection Status – Replica is inconsistent.


Because this status does not say a lot about what exactly went wrong, I looked up the Critical alert under the Monitoring tab. There the following more detailed message was shown:

The DPM job failed for SQL Server 2016 database <DBname> on <serverName > because the SQL Server instance refused a connection to the protection agent. (ID 30172 Details: Internal error code: 0x80990F75)


This issue occurs because when you create a new Availability Group by default, the location where backups should occur is set to Prefer Secondary and the setting Make Readable Secondary is set to No, which always results in MABS getting the above error.


To resolve the issue, open SQL Management Studio and connect to server instance that hosts the primary replica. Expand the Always On High Availability node and the Availability Groups node. Click the availability group whose replica you want to change and expand Availability Replicas.


Right-click the Availability Replica, and click Properties (be sure to repeat this steps for all Availability Replicas you want to backup with MABS).


In the Availability Replica Properties dialog box, set the value of the field Readable secondary to Yes. Click OK to save the new setting.


When you now run the Perform consistency check … job on the failed Protected member in the MABS console, the status should end up in OK.

If not, and the status still ends up in Replica is inconsistent, be sure to check out my previous blog post to see if the user NT Authority\SYSTEM has sysadmin rights on the SQL Server instance(s).

If on the other hand the status ends up in Online recovery point creation failed, just right-click the Protected member again and select Resume azure backups…

I hope this helps and if you have any questions feel free to contact my through my Twitter handle.

Wim Matthyssen (@wmatthyssen)