Error while consuming REST service in VC++ - rest

Question

I have used the below code to use as an example to consume the REST services in VC++. I am getting an error stating "A Connection with the Server Could Not be Established". IIs version of my system is IIS 6.0. Please let me know what could be the problem. Thanks in advance.
#include "stdafx.h"
#include "http_client.h"
#include "filestream.h"
#include "iostream"
#include "sstream"
#include "conio.h"
#include "Windows.h"
using namespace utility;
using namespace web;
using namespace web::http;
using namespace web::http::client;
using namespace concurrency::streams;
int _tmain(int argc, _TCHAR* argv[])
{
auto fileStream = std::make_shared<ostream>();
// Open stream to output file.
pplx::task<void> requestTask = fstream::open_ostream(U("results.html")).then([=](ostream outFile)
{
*fileStream = outFile;
// Create http_client to send the request.
http_client client(U("http://www.bing.com/"));
uri_builder builder(U("/search"));
builder.append_query(U("q"), U("Casablanca CodePlex"));
return client.request(methods::GET, builder.to_string());
// Build request URI and start the request.
})
// Handle response headers arriving.
.then([=](http_response response)
{
printf("Received response status code:%u\n", response.status_code());
// Write response body into the file.
return response.body().read_to_end(fileStream->streambuf());
})
// Close the file stream.
.then([=](size_t)
{
return fileStream->close();
});
// Wait for all the outstanding I/O to complete and handle any exceptions
try
{
requestTask.wait();
}
catch (const std::exception &e)
{
printf("Error exception:%s\n", e.what());
}
Sleep(5000);
return 0;
}