I don't this has anything to do with this, but I noticed that the MAC address is incorrectly labeled on the board.
What does this mean? The MAC address on the sticker on the board is the address you are supposed to put in the sketch.
//client.println("<!DOCTYPE HTML>");
//client.println("<html>");
// add a meta refresh tag, so the browser pulls again every 5 seconds:
//client.println("<meta http-equiv=\"refresh\" content=\"5\">");
// 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("</html>");
Is it really necessary to post all this commented out code? Delete it!