Issue with Azure Data Factory Pipeline Connection to SQL Server

Hi everyone,

I’m encountering an issue with my Azure Data Factory pipeline that uses a copy activity to transfer data from MariaDB. The connection is established using a self-hosted integration runtime, and everything seems to be configured correctly. The test connection is valid, and I can preview the data without any issues.

However, when I run the pipeline, I receive the following error:

```
ErrorCode=SqlFailedToConnect,'Type=Microsoft.DataTransfer.Common.Shared.HybridDeliveryException,Message=Cannot connect to SQL Database. Please contact SQL server team for further support.
Check the linked service configuration is correct, and make sure the SQL Database firewall allows the integration runtime to access.
'Type=System.Data.SqlClient.SqlException,Message=A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.
(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server),'
```

The pipeline used to work fine before, and I haven't made any changes to the linked service configuration. I have also confirmed that the IP address used by the self-hosted IR has been added to the firewall rules of the SQL server, but I’m not an admin, so I can’t verify it fully.

Has anyone encountered a similar issue or have suggestions on how to troubleshoot further?

Thanks in advance!