This is a problem that seems to be present on all HTC One X as well as some other devices running with HTC Sense. Whenever the One X creates a world and attempt to host it for other devices to connect to, no device is able to find the server. This is despite the fact that they are connected to the same WIFI AP and the server is visible. However, when the One X uses its WIFI hotspot as the WIFI AP, the server can be found by the other devices.