UE4 bind socket in iOS always say 'sandbox: deny(1) network-bind:*:0' ?

Development Programming & Scripting
1

i try to call ‘bind’ or ‘IP_BOUND_IF’ to bind a FSocketBSD to a cellular interface, but the kernel says '‘sandbox: deny(1) network-bind*:0’ when ‘bind’, and ‘errno: 22’ when IP_BOUND_IF.

while the same code works in iOS app build from scratch。

network-error