AppStore require every app support ipv6, when I develop a .io game, my agame reject by apple, the reason is the game is not support ipv6, it will stay on loading screen when they test under ipv6.

I google and found almost no one give an answer, So I read the engine code, and finaly fix it, I test the game in my dns64/nat64 env. the reason is the engine have a bug on ipv6 connect on ios, maybe the later new version engine(I use current 4.18.2) will fix it.

So I share the code for every one who have the same problem: your game connect the dedicated server on the remote, and by default, you can not connect under ipv6.

I test on Unreal Engine 4 4.18.2.

1. you must have an cpp project, if you are use a blueprint project, see the video to convert to a cpp project.

2. copy the two file to your game source path:ProjectRoot/Source/YourGame/ please remember change the YourGame to your own game name.

3. edit the Config/DefaultEngine.ini, add content:

[/Script/OnlineSubsystemUtils.IpNetDriver]

NetConnectionClassName=/Script/YourGame.TankIpConnection

4. build the game, launch on the iphone or ipad device.

If you have any question, feel free to email me:[email protected]