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  1. PO
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    <p>Well, first you should add a condition check to know if the Arduino think it worked or not:</p> <pre><code>if (client.connect(...)) { /* Stuff you do on success */ } else { Serial.println("failure! :-(") } </code></pre> <ul> <li>If it does print <code>failure!</code> you got a network configuration problem on the Arduino side. If it does work, the problem is after the Arduino.</li> </ul> <p>Then try opening a server with <code>nc -kl 42000</code> and change the port you connect to on <code>42000</code> in the Arduino <a href="http://www.arduino.cc/en/Tutorial/Sketch" rel="nofollow">sketch</a>, to be sure whether the network connection works.</p> <ul> <li>If it does work, then you've got a problem on your host side (the webserver), if it does not, you may have a problem on the network between the Arduino and the host.</li> </ul> <p>You should then try to connect to a server's <a href="http://en.wikipedia.org/wiki/IP_address" rel="nofollow">IP address</a> instead of a <a href="http://en.wikipedia.org/wiki/Fully_qualified_domain_name" rel="nofollow">fully qualified domain name</a> (FQDN). If that works, it may be the DNS server that is unreachable, and you should try to use <code>8.8.8.8</code> instead (or your local network's DNS server).</p> <p>Also check that the IP address you're using is indeed free of use (and not assigned by a <a href="http://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol" rel="nofollow">DHCP</a> or used by another computer), as well as the <a href="http://en.wikipedia.org/wiki/MAC_address" rel="nofollow">MAC address</a> is really unused... (addresses like <code>{0xDE,0xAD,0xBE,0xEF,0xFE,0xED}</code> tend to be used a lot in hacks...).</p> <p>My opinion, is that your bug is the DNS server that is unreachable, as there's no DNS resolver opened on <code>4.4.4.4</code>.</p>
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    1. POAcces to an URL with Arduino Ehernet shield
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    1. CODone! I found a connection problem ,then I have mounted a local server and it works. The problem is relative to the DHCP. Thanks!!!
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