# Diagnostic checklist for MediaTailor and CDN integrations
<a name="quick-diagnostic-checklist"></a>

AWS Elemental MediaTailor content delivery network (CDN) integration problems can manifest in various ways. Use this checklist to quickly identify the type of issue you're experiencing:

1. **Is the issue affecting all viewers or specific viewers?**
   + All viewers → Likely CDN or MediaTailor configuration issue
   + Specific viewers → Likely personalization or targeting issue

1. **Are manifests loading correctly?**
   + No → CDN routing or MediaTailor connectivity issue
   + Yes, but wrong content → Caching or personalization issue

1. **Are segments loading correctly?**
   + Content segments fail → Origin connectivity issue
   + Ad segments fail → Ad delivery or transcoding issue

1. **Are ads being inserted correctly?**
   + No ads appear → Check ADS connectivity and configuration
   + Wrong ads appear → Check ad targeting parameters and personalization
   + Ads fail to play → Check ad transcoding and segment availability

1. **Is playback smooth and uninterrupted?**
   + Buffering issues → Check CDN cache performance and origin response times
   + Playback errors → Check manifest syntax and segment availability
   + Ad transition issues → Check ad break timing and segment alignment

1. **Are there specific error codes or messages?**
   + HTTP 4xx errors → Check CDN routing and configuration
   + HTTP 5xx errors → Check origin server and MediaTailor service health
   + Player-specific errors → Check manifest format and player compatibility

**Next steps based on your diagnosis:**

CDN configuration issues  
For detailed CDN routing and caching troubleshooting, see [Troubleshoot issues with MediaTailor and CDN integration](cdn-troubleshooting.md).

Manifest and playback issues  
For manifest validation and playback troubleshooting, see [CDN integration testing procedures](cdn-testing-procedures.md).

Ad insertion and targeting issues  
For ad-specific troubleshooting including ADS connectivity and ad delivery, see your workflow-specific troubleshooting documentation.

Performance and monitoring issues  
For performance analysis and monitoring setup, see [Monitor MediaTailor CDN operations and performance](cdn-monitoring.md).

Log analysis and error codes  
For detailed log analysis and error code reference, see [CDN integration log analysis and error code reference for MediaTailor](cdn-log-error-reference.md).

Testing and validation  
For comprehensive testing procedures, see [Testing and validation for CDN and MediaTailor integrations](cdn-integration-testing.md).

If you need immediate assistance or cannot resolve the issue using the linked resources, see [Get support and troubleshooting help for CDN and MediaTailor integrations](cdn-get-help.md) for escalation procedures.