Travelclient with Onlinesubsystemsteam

When I Travelclient to a certain ip while using Onlinesubsystemsteam.
It create a FSocketBSD instance In UIpNetDriver::InitBase ,and SocketSubsystem->GetLocalBindAddr return a FInternetAddrSteam instance.
Then I got SocketSubsystem->BindNextPort failed.
What should I do here.