# Try to connect to the Ethernet Shield 2 with the WebServer

**URL:** <https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341>\
**Category:** Networking, Protocols, and Devices\
**Created:** [November 7, 2023, 9:51am UTC](https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341 "2023-11-07T09:51:13Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![edernollivier](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/edernollivier/32/1013422_2.png) [@edernollivier](https://forum.arduino.cc/u/edernollivier)\
**Post date:** [November 7, 2023, 9:51am UTC](https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341/1 "2023-11-07T09:51:13Z")

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Hello,  
I cannot connect to the Ethernet Shield 2. I do have the following message 🙂 10:48:37.591 -\> Ethernet WebServer Example  
10:48:38.107 -\> Ethernet shield was not found. Sorry, can't run without hardware. ☹  
This is with the tutoriel of the Arduino WebServer, Thanks in advance.  
Best Regards, Edern Ollivier.

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<div class="post-metadata">

**Author:** ![edernollivier](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/edernollivier/32/1013422_2.png) [@edernollivier](https://forum.arduino.cc/u/edernollivier)\
**Post date:** [November 7, 2023, 9:55am UTC](https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341/2 "2023-11-07T09:55:29Z")

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Please see : [How to connect and use WebServer over the Ethernet Shield – Arduino Help Center](https://support.arduino.cc/hc/en-us/articles/360021253779-How-to-connect-and-use-WebServer-over-the-Ethernet-Shield?queryID=490620c55866caebbf50c4ba342c5711&_gl=1*7d0ci7*_ga*MTM4MDkxMjAxNS4xNjk1NzEzMjg0*_ga_NEXN8H46L5*MTY5OTM0ODYzNS4xNi4xLjE2OTkzNTA5MDEuMC4wLjA.)

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<div class="post-metadata">

**Author:** ![edernollivier](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/edernollivier/32/1013422_2.png) [@edernollivier](https://forum.arduino.cc/u/edernollivier)\
**Post date:** [November 7, 2023, 10:15am UTC](https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341/3 "2023-11-07T10:15:15Z")

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I use this code :  
/\*  
Web Server

A simple web server that shows the value of the analog input pins.  
using an Arduino WIZnet Ethernet shield.

Circuit:

- Ethernet shield attached to pins 10, 11, 12, 13
- Analog inputs attached to pins A0 through A5 (optional)

created 18 Dec 2009  
by David A. Mellis  
modified 9 Apr 2012  
by Tom Igoe  
modified 02 Sept 2015  
by Arturo Guadalupi

\*/

#include \<SPI.h\>  
#include \<Ethernet.h\>

// Enter a MAC address and IP address for your controller below.  
// The IP address will be dependent on your local network:  
byte mac[] = {  
0xA8, 0x61, 0x0A, 0xAE, 0xE0, 0xCA  
// 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED  
};  
//IPAddress ip(192, 168, 1, 177);  
IPAddress ip(169, 254, 1, 100);  
// Initialize the Ethernet server library  
// with the IP address and port you want to use  
// (port 80 is default for HTTP):  
EthernetServer server(80);

void setup() {  
// You can use Ethernet.init(pin) to configure the CS pin  
Ethernet.init(10); // Most Arduino shields  
[//Ethernet.init](https://Ethernet.init)(5); // MKR ETH Shield  
[//Ethernet.init](https://Ethernet.init)(0); // Teensy 2.0  
[//Ethernet.init](https://Ethernet.init)(20); // Teensy++ 2.0  
[//Ethernet.init](https://Ethernet.init)(15); // ESP8266 with Adafruit FeatherWing Ethernet  
[//Ethernet.init](https://Ethernet.init)(33); // ESP32 with Adafruit FeatherWing Ethernet

// Open serial communications and wait for port to open:  
Serial.begin(9600);  
while (!Serial) {  
; // wait for serial port to connect. Needed for native USB port only  
}  
Serial.println("Ethernet WebServer Example");

// start the Ethernet connection and the server:  
Ethernet.begin(mac, ip);

// Check for Ethernet hardware present  
if (Ethernet.hardwareStatus() == EthernetNoHardware) {  
Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");  
while (true) {  
delay(1); // do nothing, no point running without Ethernet hardware  
}  
}  
if (Ethernet.linkStatus() == LinkOFF) {  
Serial.println("Ethernet cable is not connected.");  
}

// start the server  
server.begin();  
Serial.print("server is at ");  
Serial.println(Ethernet.localIP());  
}

void loop() {  
// listen for incoming clients  
EthernetClient client = server.available();  
if (client) {  
Serial.println("new client");  
// an HTTP request ends with a blank line  
bool currentLineIsBlank = true;  
while (client.connected()) {  
if (client.available()) {  
char c = client.read();  
Serial.write(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  
client.println();  
client.println("");  
client.println("");  
// 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(analogChannel);  
client.print(" is ");  
client.print(sensorReading);  
client.println("  
");  
}  
client.println("");  
break;  
}  
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  
delay(1);  
// close the connection:  
client.stop();  
Serial.println("client disconnected");  
}  
}

---

<div class="post-metadata">

**Author:** ![edernollivier](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/edernollivier/32/1013422_2.png) [@edernollivier](https://forum.arduino.cc/u/edernollivier)\
**Post date:** [November 8, 2023, 8:13am UTC](https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341/4 "2023-11-08T08:13:19Z")

</div>

Idem, it doesn't work with another IP adress.  
/\*  
Web Server

A simple web server that shows the value of the analog input pins.  
using an Arduino WIZnet Ethernet shield.

Circuit:

- Ethernet shield attached to pins 10, 11, 12, 13
- Analog inputs attached to pins A0 through A5 (optional)

created 18 Dec 2009  
by David A. Mellis  
modified 9 Apr 2012  
by Tom Igoe  
modified 02 Sept 2015  
by Arturo Guadalupi

\*/

#include \<SPI.h\>  
#include \<Ethernet.h\>

// Enter a MAC address and IP address for your controller below.  
// The IP address will be dependent on your local network:  
byte mac[] = {  
0xA8, 0x61, 0x0A, 0xAE, 0xE0, 0xCA  
// 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED  
};  
//IPAddress ip(192, 168, 1, 177);  
IPAddress ip(10, 10, 2, 14);  
// Initialize the Ethernet server library  
// with the IP address and port you want to use  
// (port 80 is default for HTTP):  
EthernetServer server(80);

void setup() {  
// You can use Ethernet.init(pin) to configure the CS pin  
Ethernet.init(10); // Most Arduino shields  
[//Ethernet.init](https://Ethernet.init)(5); // MKR ETH Shield  
[//Ethernet.init](https://Ethernet.init)(0); // Teensy 2.0  
[//Ethernet.init](https://Ethernet.init)(20); // Teensy++ 2.0  
[//Ethernet.init](https://Ethernet.init)(15); // ESP8266 with Adafruit FeatherWing Ethernet  
[//Ethernet.init](https://Ethernet.init)(33); // ESP32 with Adafruit FeatherWing Ethernet

// Open serial communications and wait for port to open:  
Serial.begin(9600);  
while (!Serial) {  
; // wait for serial port to connect. Needed for native USB port only  
}  
Serial.println("Ethernet WebServer Example");

// start the Ethernet connection and the server:  
Ethernet.begin(mac, ip);

// Check for Ethernet hardware present  
if (Ethernet.hardwareStatus() == EthernetNoHardware) {  
Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");  
while (true) {  
delay(1); // do nothing, no point running without Ethernet hardware  
}  
}  
if (Ethernet.linkStatus() == LinkOFF) {  
Serial.println("Ethernet cable is not connected.");  
}

// start the server  
server.begin();  
Serial.print("server is at ");  
Serial.println(Ethernet.localIP());  
}

void loop() {  
// listen for incoming clients  
EthernetClient client = server.available();  
if (client) {  
Serial.println("new client");  
// an HTTP request ends with a blank line  
bool currentLineIsBlank = true;  
while (client.connected()) {  
if (client.available()) {  
char c = client.read();  
Serial.write(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  
client.println();  
client.println("");  
client.println("");  
// 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(analogChannel);  
client.print(" is ");  
client.print(sensorReading);  
client.println("  
");  
}  
client.println("");  
break;  
}  
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  
delay(1);  
// close the connection:  
client.stop();  
Serial.println("client disconnected");  
}  
}

---

<div class="post-metadata">

**Author:** ![edernollivier](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/edernollivier/32/1013422_2.png) [@edernollivier](https://forum.arduino.cc/u/edernollivier)\
**Post date:** [November 8, 2023, 5:17pm UTC](https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341/5 "2023-11-08T17:17:59Z")

</div>

Good, I have solved by DHCP the troubleshoot, please see the code below 🙂  
/\*  
DHCP-based IP printer

This sketch uses the DHCP extensions to the Ethernet library  
to get an IP address via DHCP and print the address obtained.  
using an Arduino WIZnet Ethernet shield.

Circuit:  
Ethernet shield attached to pins 10, 11, 12, 13

created 12 April 2011  
modified 9 Apr 2012  
by Tom Igoe  
modified 02 Sept 2015  
by Arturo Guadalupi

\*/

#include \<SPI.h\>  
#include \<Ethernet.h\>

// Enter a MAC address for your controller below.  
// Newer Ethernet shields have a MAC address printed on a sticker on the shield  
byte mac[] = {  
0xA8, 0x61, 0x0A, 0xAE, 0xE0, 0xCA  
// 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED  
};

// port utilisé (par défaut 80 pour le protocole HTTP)  
EthernetServer server(80);

void setup() {  
// You can use Ethernet.init(pin) to configure the CS pin  
[//Ethernet.init](https://Ethernet.init)(10); // Most Arduino shields  
[//Ethernet.init](https://Ethernet.init)(5); // MKR ETH Shield  
[//Ethernet.init](https://Ethernet.init)(0); // Teensy 2.0  
[//Ethernet.init](https://Ethernet.init)(20); // Teensy++ 2.0  
[//Ethernet.init](https://Ethernet.init)(15); // ESP8266 with Adafruit FeatherWing Ethernet  
[//Ethernet.init](https://Ethernet.init)(33); // ESP32 with Adafruit FeatherWing Ethernet

// Open serial communications and wait for port to open:  
Serial.begin(9600);  
while (!Serial) {  
; // wait for serial port to connect. Needed for native USB port only  
}

// start the Ethernet connection:  
Serial.println("Initialize Ethernet with DHCP:");  
if (Ethernet.begin(mac) == 0) {  
Serial.println("Failed to configure Ethernet using DHCP");  
if (Ethernet.hardwareStatus() == EthernetNoHardware) {  
Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");  
} else if (Ethernet.linkStatus() == LinkOFF) {  
Serial.println("Ethernet cable is not connected.");  
}  
// no point in carrying on, so do nothing forevermore:  
while (true) {  
delay(1);  
}  
}  
// print your local IP address:  
Serial.print("My IP address: ");  
Serial.println(Ethernet.localIP());

server.begin();  
Serial.print("server is at ");  
Serial.println(Ethernet.localIP());  
}

void loop() {  
/\*  
switch (Ethernet.maintain()) {  
case 1:  
//renewed fail  
Serial.println("Error: renewed fail");  
break;

```
case 2:
  //renewed success
  Serial.println("Renewed success");
  //print your local IP address:
  Serial.print("My IP address: ");
  Serial.println(Ethernet.localIP());
  break;

case 3:
  //rebind fail
  Serial.println("Error: rebind fail");
  break;

case 4:
  //rebind success
  Serial.println("Rebind success");
  //print your local IP address:
  Serial.print("My IP address: ");
  Serial.println(Ethernet.localIP());
  break;

default:
  //nothing happened
  break;

```

}\*/  
// crée un objet client basé sur le client connecté au serveur  
EthernetClient client = server.available();  
if (client) { // si le client existe  
// message d'accueil dans le Terminal Série  
Serial.println ("Client present !");  
while (client.connected()) { // tant que le client est connecté  
if (client.available()) { // si des octets sont disponibles en lecture  
// le test est vrai si il y a au moins 1 octet disponible  
char c = client.read(); // lit l'octet suivant reçu du client (pour vider le buffer au fur à mesure !)  
} // --- fin client.available  
else { // si pas de caractères disponibles = requete client terminée

```
// message Terminal Serie 
Serial.println ("Reception requete terminee"); 

// envoi d'une entete standard de réponse http
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();

// affiche chaines caractères simples
client.print("Hello World"); // page HTML simple

// message Terminal Serie
Serial.println ("Reponse envoyee au client"); 
break; // on sort de la boucle while
}

```

}  
// on donne au navigateur le temps de recevoir les données  
delay(1);  
// fermeture de la connexion avec le client  
client.stop();  
}  
}

---

<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 6, 2024, 5:18pm UTC](https://forum.arduino.cc/t/try-to-connect-to-the-ethernet-shield-2-with-the-webserver/1186341/6 "2024-05-06T17:18:52Z")

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