WSA Refusing connection - howto find out the server refused connection?

[matesisko]

hi, im refusing connection by server, if the client is on the black list. but i cant find out (in the client code), the serve refused.
the client code is:

        struct sockaddr_in ServerAddress;

	SOCKET Socket = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED);

	if (INVALID_SOCKET == Socket) 
	{
		ErrorExit("WSASocket error", WSAGetLastError());
		return SOCKET_ERROR; //error
	}

	WSAEVENT eevent = WSACreateEvent();

	WSAEventSelect(Socket, eevent, FD_CONNECT);


	ZeroMemory((char *) &ServerAddress, sizeof(ServerAddress));


	ServerAddress.sin_family = AF_INET;
	ServerAddress.sin_addr.S_un.S_addr = ulIp;
	ServerAddress.sin_port = htons(nPortNo);

	
	if (SOCKET_ERROR == WSAConnect(Socket, reinterpret_cast<const struct sockaddr *>(&ServerAddress),sizeof(ServerAddress), 
		NULL, NULL, NULL, NULL)) 
	{
		int iErrCode = WSAGetLastError();
		if(iErrCode != WSAEWOULDBLOCK)
		{
			closesocket(Socket);
			ErrorExit("WSAConnect error", iErrCode);
			return SOCKET_ERROR; //error
		}
	}

	DWORD retCode = WSAWaitForMultipleEvents(1, &eevent, TRUE, INFINITE, FALSE);
	WSANETWORKEVENTS NetworkEvents;
	if((retCode != WSA_WAIT_FAILED) && (retCode != WSA_WAIT_TIMEOUT))
	{
		if(WSAEnumNetworkEvents(Socket, eevent, &NetworkEvents) == SOCKET_ERROR)
		{
			int iErrCode = WSAGetLastError();
		}
		if((NetworkEvents.lNetworkEvents & FD_CONNECT ) == FD_CONNECT)
		{
			int iErrCode = WSAGetLastError();
			if(iErrCode == WSAECONNREFUSED)
			{
				ErrorExit("Server refuse!", iErrCode);
				return SOCKET_ERROR;
			}
		}
	}

	return Socket;

the WSAECONNREFUSED error never occurs. how it is possible? whats wrong? im sure the server refuse connection.
thanks

[ahoodin]

Perhaps it is occurring at the router frame or some other firewall. Have you tested a traceroute?

[matesisko]

i will try it. its some possibility to fix it? the FD_CONNECT event occurs but WSAECONNREFUSED error not.

[matesisko]

i cant capture packets in wireshark or ethereal because they cant capture localhost packets. i tried to fix it like this http://wiki.wireshark.org/CaptureSetup/Loopback but it didnt fix it