# Fix CDN inconsistent behavior across devices and platforms for MediaTailor
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AWS Elemental MediaTailor content delivery network (CDN) integration should provide consistent ad delivery across all devices and platforms. If ads behave differently across devices:

1. Ensure consistent header forwarding across all CDN behaviors.
   + Verify that User-Agent, X-Forwarded-For, and custom targeting headers are forwarded consistently
   + Check that header forwarding rules apply to all relevant cache behaviors

1. Verify player compatibility with your CDN configuration.
   + Test with multiple player types (HLS.js, Video.js, native players) to identify player-specific issues
   + Check for player-specific header requirements or URL handling differences

1. Test with multiple device types to identify device-specific issues.
   + Include mobile devices, tablets, smart TVs, and desktop browsers in your testing
   + Test different operating systems and browser versions
   + Verify that device-specific ad targeting works correctly

If you've followed these troubleshooting steps and still need assistance, see [Get CDN integration support](cdn-get-help.md).