Getting IP but cannot connect


First of all, this is the output I got in my serial monitor window:

Attempting to connect to SSID: CMN
IP Address:
signal strength (RSSI):-68 dBm

But when I look on my firewall/dhcp server, I dont see this IP there… not sure what I am doing wrong. Below is the sketch for the same:

WiFi Web Server

A simple web server that shows the value of the analog input pins.
using a WiFi shield.

This example is written for a network using WPA encryption. For
WEP or WPA, change the Wifi.begin() call accordingly.


  • WiFi shield attached
  • Analog inputs attached to pins A0 through A5 (optional)

created 13 July 2010
by dlf (Metodo2 srl)
modified 31 May 2012
by Tom Igoe


#include <SPI.h>
#include <WiFi.h>

char ssid = “CMN”; // your network SSID (name)
char pass = “7A241C3DB4”; // your network password
int keyIndex = 0; // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(80);

void setup() {
//Initialize serial and wait for port to open:
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only

// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println(“WiFi shield not present”);
// don’t continue:

pinMode(4, OUTPUT);
digitalWrite(4, HIGH);


// attempt to connect to Wifi network:
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid, pass);

// wait 10 seconds for connection:
// you’re connected now, so print out the status:

void loop() {
// listen for incoming clients
WiFiClient 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 =;
// if you’ve gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == ‘\n’ && currentLineIsBlank) {
// send a standard http response header
client.println(“HTTP/1.1 200 OK”);
client.println(“Content-Type: text/html”);
client.println(“Connection: close”); // the connection will be closed after completion of the response
client.println(“Refresh: 5”); // refresh the page automatically every 5 sec
// output the value of each analog input pin
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print(“analog input “);
client.print(” is “);
if (c == ‘\n’) {
// you’re starting a new line
currentLineIsBlank = true;
else if (c != ‘\r’) {
// you’ve gotten a character on the current line
currentLineIsBlank = false;
// give the web browser time to receive the data

// close the connection:
Serial.println(“client disonnected”);

void printWifiStatus() {
// print the SSID of the network you’re attached to:
Serial.print("SSID: ");

// print your WiFi shield’s IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");

// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print(“signal strength (RSSI):”);
Serial.println(" dBm");

Some dhcp server is issuing this address.

IP Address:

Are you certain you are looking in the right place on your router? Mine shows up under "ip dhcp-server lease".


Yes. I am certain. I looked it up everywhere. Basically this sketch is supposed to create a simple web server that I can browse to but when I do, I see "Page not found"

If the response is "Page not found" instead of "unable to connect to the server", you have a problem. That is a response after the client connects to the server successfully, but the server was unable to find the requested file.

are you using in your web browser address bar?

Yes. that is exactly what I am typing. I even added some more parameters to my Serial Monitor output:

Attempting to connect to SSID: CMN
IP Address:
Subnet Mask:
signal strength (RSSI):-70 dBm

So the gateway and Subnet are correct. It is getting the correct info.

The Arduino code you are using doesn't send a "Page not found" error. That is sent by the server AFTER the connection is established and the client sends a page request. ??