UDPS-542 — Proxy cannot receive responses from server
When forcing the source port toward the server, the proxy does not create a new socket on the server side. If it did so, it could not distinguish among different sessions from the same client. Therefore the proxy uses for sending and receiving datagrams on the server side one of its listening sockets. If such a socket is not found, this message is logged and the session is rejected.
Add proper listening socket, to allow such a communication.