# ArduinoUNO R3 Board fails to run the built-in Web Client example Program using W5100 Ethernet Shield

**URL:** <https://community.sparkfun.com/t/arduinouno-r3-board-fails-to-run-the-built-in-web-client-example-program-using-w5100-ethernet-shield/35458>\
**Category:** Arduino\
**Created:** [April 15, 2018, 4:41pm UTC](https://community.sparkfun.com/t/arduinouno-r3-board-fails-to-run-the-built-in-web-client-example-program-using-w5100-ethernet-shield/35458 "2018-04-15T16:41:26Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Abhaya\_Kumar](https://avatars.discourse-cdn.com/v4/letter/a/c77e96/32.png) [@Abhaya\_Kumar](https://community.sparkfun.com/u/Abhaya_Kumar)\
**Post date:** [April 15, 2018, 4:41pm UTC](https://community.sparkfun.com/t/arduinouno-r3-board-fails-to-run-the-built-in-web-client-example-program-using-w5100-ethernet-shield/35458/1 "2018-04-15T16:41:26Z")

</div>

Dear Friends,

I am using Arduino IDE 1.8.4 to teach various programming examples to my B.Tech.(CSE) students.

Using ArduinoUNO R3 Board stacked with WIZnet W5100 Ethernet Shield, I am experimenting with various programming configurations (Web Server and Web Client) of this Ethernet shield with the help of built-in examples.

I could successfully configure the Ethernet Shield as Web Server using the supplied example program.

However, whenever I am trying with the Web Client Programing example, the program fails at call to the function client.connect(server, 80). The function returns 0 (zero).

I requesting the forum to sort out the problem and guide me how to configure the W5100 Ethernet Shield as Web Client using the built-in example program.

With sincere regards and thanks in advance

Abhaya