You can start with this old thread : https://learn.microsoft.com/en-us/answers/questions/336122/azure-data-factory-azure-sql-connectivity-error-a
The message that you are getting often indicates an intermittent or unresolved network connectivity issue between your SHIR VM and ADF.
Verify that your SHIR VM can resolve the Data Factory endpoint. You can test DNS resolution by running:
nslookup <data-factory-endpoint>
or
ping <data-factory-endpoint>
Make sure that no firewall, NSG, or other security measures are blocking outbound traffic from your SHIR VM to ADF. Specifically, the SHIR VM needs access to:
- Port 443 (for HTTPS traffic)
- Azure Data Factory’s public IP range and service endpoints.
You can check the logs on the SHIR VM. Navigate to the SHIR installation directory (usually C:\Program Files\Microsoft Integration Runtime\4.x\Shared\Log) and review the logs for detailed error messages that might indicate connectivity issues or other failures.
One last thing, if your SHIR encounters intermittent network issues, you can implement retry policies in your ADF activities (e.g., copy activities) to automatically retry in case of failure.