We are developing online game with Unity 2018.4. We used LiteNetLib and Lidgren as Network Library. Our build works on android, IOS, PC. We tested all things like low battery mode, slow connection mode with iPhone11 IOS 13.3.1 and all works well. We sent our game to Apple for review. After apple staffs are trying to connect our server. Peer connected but timeout in 5 sec. And at client side socket connection failed. Same os same device works well at our side additionally, iPhone 7, İphone 8+ etc works, too. PC, Android versions works, too. What can we do at this stage?