outside my network not working

Hi all.

I have never worked with ethernet shields

yesterday i tried my new ethernet shield and set up a webserver

i opened a port 8081 ( in my router settings)for me to access it when i am accessing the webserver

outside the network

within the network i can control my arduino uno rev 3 (wi fi)

thru my three mobile phones(IE, chrome, safari) and the three browsers(IE, chrome, firefox) on my PC by using

the ethernet shield ip address plus :8081

but when I am not within the network ( i access it away from home using my mobile phones in chrome and safari)

i can access my webserver by using my public ip address plus : 8081

but i cannot control my arduino board

note: I have disabled SPI in my router settings/ port forwarding 8081/ disabled all my pc firewalls

Please give me some hint why this is happening

Thousand thanks, folks.

 * Web Server LED Control 
 * @author Miguel Alvarez 
 * @date    27-FEB-2015 
 * @details A sketch that displays an HTML page with three 
 *          buttons to toggle three digital pins. You may
 *          connect an LED to pins 2,3, and 5 with a 1k
 *          resistor. Then visit the IP address (printed in the
 *          serial window) in a web browser. Tested on this
 *          version of the shield:
 *          http://www.seeedstudio.com/depot/W5200-Ethernet-Shield-p-1577.html
 *          For more detail instructions and example output see:
 *          http://www.seeedstudio.com/wiki/Ethernet_Shield_V2.4
 * @circuit Stack the W5200 Ethernet Shield from Seeed Studio on 
 *          the Arduino board. Connect Three leds and 1k
 *          resistors to pins 2, 3, and 5.

#include <SPI.h>
#include <EthernetV2_0.h>
int pins[] = {2,3,5,6,7,8,9}; // the digital pins you want to control. 
// NOTE: do not attempt to control the pins used by the SPI bus or 0,1, and 4 pins
// define the controller's MAC address
byte mac[] = { 
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
 //IPAddress ip(192,168,0,111);   
// set the server at port 80 for HTTP
int port = 8081;
String ipAddress = "";
EthernetServer server(port);// (((((((((((((((((((((((((((((((((
// Ethernet controller SPI CS pin
#define W5200_CS  10
// SD card SPI CS pin
#define SDCARD_CS 4
void setup() {
  // the pins to be OUTPUTS and be LOW intially
  for(int i=0; i<sizeof(pins)/sizeof(pins[0]);i++)
  // make sure that the SD card is not selected for the SPI port
  // by setting the CS pin to HIGH
  // loop until we get a connection to the access point
    Serial.println("DHCP configuration failed. Trying again...");
  // now that we have a good ethernet connection we can start the server
  Serial.print("The server can be accessed at: ");
  IPAddress ip = Ethernet.localIP();
  ipAddress += ip[0];
  ipAddress+= ".";
  ipAddress += ip[1];
  ipAddress += ".";
  ipAddress += ip[2];
  ipAddress += ".";
  ipAddress += ip[3];
void loop() {
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // look for the string "pin=" in the browser/client request
        if (!client.find("pin=")) { 
          // the string "pin=" is not present in the browser/client HTTP request
          // so display the buttons webpage.
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connnection: close");
          client.println("<!DOCTYPE HTML>");
          // Now the HTML page body follows.
          client.print("<title>The Little Boy</title>");
        client.print("<style> body {background: #F4C2C2;} </style>");
       client.print("<img src=http://images.cooltext.com/4172769.gif>");
       client.print("<h1><font color =#40E0D0>Ngo...Ngo...Ngo...Leman Web Control </font></h1>");
          // Create the HTML button code e.g. <button id="xx" class="led">Toggle Pin xx</button> where xx is the pin number
    // In the <button id="xx" class="led"> tags, the ID attribute is the value sent to the arduino via the "pin" GET parameter
           for(int i=0; i<sizeof(pins)/sizeof(pins[0]);i++)
              String buttonHTML = "<button id=\"";
              buttonHTML+="\" class=\"led\">Control ";
          // Include the JQuery library. Note: the computer that loads this page will need an internet connection.
          client.print("<script src=\"http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js\"></script>"); // include the JQuery library hosted by Google
          // Javascript code that receives the button clicks and the correct pin back to the shield
          client.print("<script type=\"text/javascript\">"); // beg javascript code
          client.print("var p = $(this).attr('id');"); // get id value (i.e. pin13, pin12, or pin11)
          // create the JQuery $.get function "$.get(\"http://ipaddress:port/\", {pin:p},function(data){alert(data)});"
          // The .get functions sends and HTTP GET request to the IP address of the shield with the parameter "pin" and value "p", then executes the function alert
          String get = "$.get(\"http://";
          get+="/\", {pin:p},function(data){alert(data)});";
          client.print("});"); // close the click function
          client.print("});"); // close the read function
          client.print("</script>"); // end the javascript snippet
          client.print("</body>"); // end HTML body
          client.print("</html>"); // end HTML 
          // The string "pin=" is found in the browser/client rquest, this meanst that the user wants to toggle the LEDs
          int pinNumber = (client.read()-48); // get first number i.e. if the pin 13 then the 1st number is 1
          int secondNumber = (client.read()-48);
          if(secondNumber>=0 && secondNumber<=9)
          pinNumber +=secondNumber; // get second number, i.e. if the pin number is 13 then the 2nd number is 3, then add to the first number
          digitalWrite(pinNumber, !digitalRead(pinNumber)); // toggle pin 
          // Build pinstate string. The Arduino replies to the browser with this string.
          String pinState = "Pin ";
          pinState+=" is ";
          if(digitalRead(pinNumber)) // check if the pin is ON or OFF
          pinState+="ON"; // the pin is on
           pinState+="OFF";  // the pin is off
          // Send HTTP response back to browser/client
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connnection: close");
    // give the web browser time to receive the data
    // close the connection:
    Serial.println("client disonnected");

This is probably the reason. This uses your localnet IP in the JQuery, and it is not reachable from the internet.

          String get = "$.get(\"http://";

You must find your public IP and use it instead of the variable ipAddress.

Thanks a lot.

I will look into that.

  get += "my public ip address here  thanks for your help ";
           String get = "$.get(\"http://";
          get += ipAddress;

this way i can keep the alert :D