Fix IPV6 error while upload IOS App

We are having a Windows Server 2008 Enterprise OS server. IOS app is using a web service (PHP) for collecting video and audio content. We upload the app on Apple store, but due to following error its rejected. We like to solve following error and upload the app on apple store: Guideline 2.1 - Performance - App Completeness We discovered one or more bugs in your app when reviewed on an iPad Air running iOS 11.3 on Wi-Fi connected to an IPv6 network. Specifically, no videos play when tapped on. Please see attached screenshots for details. Next Steps To resolve this issue, please run your app on a device to identify any issues, then revise and resubmit your app for review. If we misunderstood the intended behavior of your app, please reply to this message in Resolution Center to provide information on how these features were intended to work. For new apps, uninstall all previous versions of your app from a device, then install and follow the steps to reproduce the issue. For updates, install the new version as an update to the previous version, then follow the steps to reproduce the issue. Resources For information about testing your app and preparing it for review, please see Technical Note TN2431: App Testing Guide.