Http winsock problem

Hi,

I am creating a Http client application using winsock, evc++ 4.0 and K-
Jam (WIndows Mobile 5) that will get data from Http server. I am using
the following code.

WSADATA wsaData;
    CString csErr;

    memset(&wsaData, 0, sizeof(WSADATA));
    if(WSAStartup(MAKEWORD(1,1), &wsaData) != 0)
    {
        AfxMessageBox(_T("WSAStartup Error"));
        return;
        //return FALSE;
    }

    // Create a connection-oriented socket
    SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    // Check to see if we have a valid socket
    if(s == INVALID_SOCKET)
    {
        //AfxMessageBox(_T("Error Invalid Socket"));
        int iSocketError = WSAGetLastError();
        csErr.Format(_T("Socket Error :: %d"),iSocketError);
        AfxMessageBox(csErr);

        return;
        //return FALSE;
    }

    // Get the host information
    HOSTENT *hostServer = gethostbyname("www.xxxxxx.com");
    if(hostServer == NULL)
    {
        int iSocketError = WSAGetLastError();
        csErr.Format(_T("GetHostByName Error :: %d"),iSocketError);
        AfxMessageBox(csErr);
        //AfxMessageBox(_T("Error Get Host By Name"));
        return;
        //return FALSE;
    }

    // Set up the target device address structure
    SOCKADDR_IN sinServer;

    memset(&sinServer, 0, sizeof(SOCKADDR_IN));

    sinServer.sin_family = AF_INET;
    sinServer.sin_port = htons(80);
    sinServer.sin_addr = *((IN_ADDR *)hostServer->h_addr_list[0]);

    // Connect
    if(connect(s, (SOCKADDR *)&sinServer, sizeof(sinServer)) ==
SOCKET_ERROR)
    {
        int iSocketError = WSAGetLastError();
        csErr.Format(_T("Connect Error :: %d"),iSocketError);
        AfxMessageBox(csErr);
        return;
        //return FALSE;
    }

    // Send a request to the server
    char cBuffer[1024] = "";
    int nBytesSent = 0;
    int nBytesIndex = 0;

    // Set up the buffer to send
    //sprintf(cBuffer, "GET / HTTP/1.0\r\n\r\n");

    sprintf(cBuffer, "GET /activation/activate.php?Version=3.0b HTTP/1.0\r
\n\r\n");
    int nBytesLeft = strlen(cBuffer);

    // Send the entire buffer
    while(nBytesLeft > 0)
    {
        nBytesSent = send(s, &cBuffer[nBytesIndex], nBytesLeft, 0);
        if(nBytesSent == SOCKET_ERROR)
        {
            AfxMessageBox(_T("Error Sending Data"));
            break;
        }

        csErr.Format(_T("Data Send :: %d"),nBytesSent);
        AfxMessageBox(csErr);

        // See how many bytes are left. If we still need to send, loop
        nBytesLeft -= nBytesSent;
        csErr.Format(_T("Sending Bytes Left :: %d"),nBytesLeft);
        AfxMessageBox(csErr);
        nBytesIndex += nBytesSent;
    }

    // Get the response
    TCHAR tchResponseBuffer[1024] = TEXT("\0");
    char cResponseBuffer[1024] = "";
    BOOL fBreak = FALSE;
    int nBytesReceived = 0;

    while(!fBreak)
    {
        nBytesReceived = recv(s, &cResponseBuffer[0], 1024, 0);
        if(nBytesReceived == SOCKET_ERROR)
        {
            AfxMessageBox(_T("Error Receiving Data"));
            break;
        }

        csErr.Format(_T("Bytes Received :: %d"),nBytesReceived);
        AfxMessageBox(csErr);

        //AfxMessageBox(_T("Data Received Successfully"));
        // Convert the data from ANSI to Unicode
        mbstowcs(tchResponseBuffer, cResponseBuffer, nBytesReceived);

        // Show the MessageBox
        AfxMessageBox(tchResponseBuffer);

        // Check to see if this is the end of the HTTP response by
        // looking for \r\n\r\n
        if(_tcsstr(tchResponseBuffer, TEXT("\r\n\r\n")))
            fBreak = TRUE;

        // Clear the buffers
        memset(tchResponseBuffer, 0, 1024);
        memset(cResponseBuffer, 0, 1024);
    }

    closesocket(s);
    WSACleanup();

Everything works fine but i get 500 Internal server error. Can anybody
has faced the same issue? Is that due to the HTTP/1.0 version or is it
a PHP proble?

Regards
Rajat