Incident Summary Date: July 15, 2025 Time: 4:42 am Severity: High Duration: ~ 5 hours Status: Resolved
Issue Description The CabMD API experienced a critical failure due to a missing SQL Server Native Client library dependency. The application was unable to load the required DLL file `Microsoft.Data.SqlClient.SNI.x64.dll`, resulting in a complete service outage.
Impact - Complete unavailability of the CabMD API - Mobile application non-functional
Root Cause Suspected Cause: Azure infrastructure-related issue Evidence: - Issue occurred during off-hours with no recent deployments or changes - Missing system library suggests infrastructure-level disruption - Timing aligns with potential Azure maintenance or updates
Investigation Status: Root cause analysis ongoing
Resolution 1. Immediate Action: Restored the missing Microsoft.Data.SqlClient.SNI.x64.dll library 2. Deployment: Redeployed the application with the restored dependency 3. Verification: Confirmed system functionality and database connectivity restored
Timeline - 7 AM - Issue detected - 9:30 AM - Investigation began - 9:31 AM - Missing library identified - 9:34 AM - Library restored and redeployment initiated - 9:35 AM - Service fully restored
Follow-up Actions 1. Monitoring: Enhanced monitoring for dependency-related failures 2. Infrastructure Review: Coordinate with Azure support to investigate potential infrastructure issues 3. Preventive Measures: - Review deployment artifacts to ensure all dependencies are properly packaged - Consider implementing dependency health checks - Document recovery procedures for similar incidents