Arduino connection with the server failed

I am trying to connect arduino uno and ethernet shield and try to send some data to an asp.net web api application. When i upload the sketch, i get in the serial monitor connection failed. I don't understand what's going wrong ? Below is the code i am using

#include "cactus_io_DHT22.h"
#include <SPI.h>
#include <Ethernet.h>
#include <Client.h>

#define DHT22_PIN 2

byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xDD };

IPAddress ip(192,168,0,177);
IPAddress server(192,168,0,11);
EthernetClient client;

DHT22 dht(DHT22_PIN);
float heatindex1 =0.00;
float heatindex2 = 0.00;


void setup() {
  Ethernet.begin(mac,ip);   
    delay(1000);  Serial.begin(9600); 

    Serial.println("connecting...");   
    if (client.connect(server, 80)) {
      Serial.println("connected :D ");   
    }
  Serial.print("Arduino server IP address: ");
  Serial.println(Ethernet.localIP());
  Serial.println("DHT22 Humidity - Temperature Sensor");
  Serial.println("RH\t\tTemp (C)\tTemp (F)\tHeat Index (C)\t Heat Index     
 (F)\t Max(C)\t\t Min(C)");

  dht.begin();
  dht.readHumidity();
  dht.readTemperature();

}

float max1=dht.temperature_C;
 float min1=100;

void loop() {
  dht.readHumidity();
  dht.readTemperature();
  heatindex1=dht.computeHeatIndex_C();
  heatindex2=dht.computeHeatIndex_F();


  if(dht.temperature_C>max1)
  {max1=dht.temperature_C;}
  if(dht.temperature_C<min1)
  {min1=dht.temperature_C;}

  // Check if any reads failed and exit early (to try again).
  if (isnan(dht.humidity) || isnan(dht.temperature_C)) {
    Serial.println("DHT sensor read failure!");
    return;
  }
  if (client) {

   // When a client sends a request to a webserver, that request ends with a blank line
    boolean currentLineIsBlank = true;

    Serial.println("OK"); }

  if (client.connect(server, 80)) {
    client.print("GET /api/todo?humidity="); 
    client.print(dht.humidity);
    client.print("&temperature1="); 
    client.print(dht.temperature_C);
    client.print("&temperature2="); 
    client.print(dht.temperature_F);
    client.print("&heatindex1="); 
    client.print(heatindex1);
    client.print("&heatindex2="); 
    client.print(heatindex2);
    client.print("&max1="); 
    client.print(max1);
    client.print("&min1="); 
    client.print(min1);// And this is what we did in the testing section above. We are making a GET request just like we would from our browser but now with live data from the sensor
    client.println(" HTTP/1.1"); // Part of the GET request
    client.println("Host: 192.168.0.11"); // IMPORTANT: If you are using XAMPP you will have to find out the IP address of your computer and put it here (it is explained in previous article). If you have a web page, enter its address (ie.Host: "www.yourwebpage.com")
    client.println("Connection: close"); // Part of the GET request telling the server that we are over transmitting the message
    client.println(); // Empty line
    client.println(); // Empty line
    client.stop();    // Closing connection to server

  }

  else {
    //If Arduino can't connect to the server (your computer or web page)
    Serial.println("--> connection failed\n");
  }

   Serial.print(dht.humidity); Serial.print(" %\t\t");
  Serial.print(dht.temperature_C); Serial.print(" *C\t");
  Serial.print(dht.temperature_F); Serial.print(" *F\t");
  Serial.print(dht.computeHeatIndex_C()); Serial.print(" *C\t ");
  Serial.print(dht.computeHeatIndex_F()); Serial.print(" *F\t ");
  Serial.print(max1); Serial.print(" *C\t ");
  Serial.print(min1); Serial.println(" *C\t");

  delay(5000);
}