I have two classes UDPSender and UDPReceiver. Senarios: (1)It works when I run UDPSender in QNX and UDPReceiver in Linux. (2)It doesn't work when I run UDPSender in QNX and UDPReceiver in WindowsXP.(But I see UDP datagrams using Wireshark, meaning Sender is working as in Senario(1)) (3)It partially works in Windows. i) if I use Sender sending UDP messages to 127.0.0.1, Receiver can get messages ii) if I use Sender sending UDP messages to 192.168.1.137( local address in the network ), Receiver can NOT receive. My question is: *How can I get Receiver working on Windows?* ------------------------------------------------------------------------------------------------------------------------------------------ some code: UDPReceiver::UDPReceiver( boost::asio::io_service& service, unsigned short port ) : m_service( service ), m_socket( service, udp::endpoint(udp::v4(), port)), m_peerEndpoint(), m_buffer(), m_messageReceipient() { } void UDPReceiver::SetMessageReceipient( const boost::function<void(const char*, unsigned int)>& r ) { m_messageReceipient = r; } void UDPReceiver::Start() { m_socket.async_receive_from( boost::asio::buffer(m_buffer, m_buffer.size()), m_peerEndpoint, boost::bind( &UDPReceiver::HandleReceived, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void UDPReceiver::Stop() { m_socket.close(); } void UDPReceiver::HandleReceived( const boost::system::error_code& error, size_t bytesReceived ) { assert( !m_messageReceipient.empty() ); if( error ) { LOG( Comms, Error, "UDPReceiver:" << error.message() ); } else{ m_messageReceipient( &m_buffer.front(), bytesReceived ); m_socket.async_receive_from( boost::asio::buffer(m_buffer, m_buffer.size()), m_peerEndpoint, boost::bind( &UDPReceiver::HandleReceived, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } }