Summary of Impact: Between 04:00 UTC on 01 Feb 2021 and 08:00 on 05 Feb 2021, you were identified as a customer using Azure SQL Database who may have experienced connection errors when accessing your database.    

Preliminary Root Cause: We determined that the issue was caused due to a recent deployment which had a configuration error that affected the underlying backend infrastructure, resulting in connection failures.      

Mitigation: We attempted to mitigate by rolling back the deployment, but found that it was not sufficient due to cached state. As such, we performed a new deployment to fix the configuration to the backend infrastructure to mitigate the issue.    

Next Steps: We sincerely apologize for the impact to affected customers. We will continue to investigate to establish the full root cause and prevent future occurrences. Stay informed about Azure service issues by creating custom service health alerts: https://aka.ms/ash-videos for video tutorials and https://aka.ms/ash-alerts for how-to documentation.