If the video is not displayed
This may be seen by disabling IPv6.
Procedure.
Windows OS
1、Select "Network and Internet" from the settings
2、Select "Change adapter options" from the "Network and Internet status".
3、Right-click "(target network adapter)" from the network connection and select "Properties".
4, Uncheck [Internet Protocol Version 6 (TCP/IP)] from the properties of (network adapter).
MacOS
1、Click "System Preferences" from the Apple menu (apple symbol).
2、Select "Network".
3、Select the network you are using from "Network Environment" and click "Advanced Settings".
4、Select [TCP/IP] and select [Off] from the [IPv6 Configuration] pull-down menu, then click [OK].