unsigned __stdcall ReadSynMessage(void* pArg)
{
	CCDBConnection *pCCDBConnection = (CCDBConnection*)pArg;
	SYSTEMTIME st;
	SOCKET s;
	sockaddr_in local, multi, sender;
	DWORD numberOfByteRecvd, flags;
	int opt, sentsize, recvRes, recvErr;
	WSABUF wsaBuf;

	flags = numberOfByteRecvd =  0 ;
	// на всякий случай
	wsaBuf.buf = (char*)&st;
	wsaBuf.len = sizeof(st);
	::memset(&sender,  0 , sizeof(sender));
	::memset(&st,  0 , sizeof(st));
	// создаем сокет
	s = WSASocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, NULL,  0 , WSA_FLAG_MULTIPOINT_C_LEAF  
                    | WSA_FLAG_MULTIPOINT_D_LEAF);
	//привязка к локальному адресу
	memset(&local,  0 , sizeof(local)); 	     
	local.sin_family = AF_INET; 
	local.sin_port   = htons( 9333 ); 
	local.sin_addr.s_addr = htonl(INADDR_ANY);      
	bind(s, (sockaddr*)&local, sizeof(local)); 
	//многоадресная группа
	memset(&multi,  0 , sizeof(multi)); 
	multi.sin_family      = AF_INET; 
	multi.sin_port        = htons( 9334 ); 
	multi.sin_addr.s_addr = inet_addr("125.124.123.2"); 
	//указываем число маршрутизаторов 
	opt =  2 ;
	setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, (char*)&opt, sizeof(opt)); 
	//запрещаем петлю
	opt =  0 ; 
	setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, (char*)&opt, sizeof(opt)); 
	//присоединяемся к многоадресной группе 
	WSAJoinLeaf(s, (sockaddr*)&multi, sizeof(multi), NULL, NULL, NULL, NULL, JL_RECEIVER_ONLY);

	while (WaitForSingleObject(::hevStopApp,  10 ) == WAIT_TIMEOUT)
	{
		recvRes = ::WSARecvFrom(s, &wsaBuf,  1 , &numberOfByteRecvd, 
					&flags, (sockaddr*)&sender, &sentsize, NULL, NULL); // здесь recvRes = -1
		if (recvRes != SOCKET_ERROR && numberOfByteRecvd)
			::SendMessage(pCCDBConnection->m_hWnd, WM_SYNTIME, (WPARAM)&st, NULL);
		else
			recvErr = ::WSAGetLastError();  // здесь вываливается 10014, т.е. "Bad address"
	}
	return  0 ;
}

sentsize = sizeof(sender);