Returns the incoming port.
PRL_RESULT PrlPortFwd_GetIncomingPort( PRL_HANDLE hPortFwd, PRL_UINT16_PTR pnIncomingPort );
PrlApiNet.h
PRL_RESULT. Possible values:
PRL_ERR_INVALID_ARG - invalid handle or null pointer was passed.
PRL_ERR_SUCCESS - function completed successfully.