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    <p>Although PayPal extended the support for HTTP1.0 until May 1, 2013 they may have updated the Sandbox already for HTTP1.1 support only.</p> <p><a href="https://www.x.com/content/bulletin-ipn-and-pdt-scripts-and-http-1-1" rel="nofollow">https://www.x.com/content/bulletin-ipn-and-pdt-scripts-and-http-1-1</a></p> <p>If this is true you will need to update your callback script as follows.</p> <pre><code>// post back to PayPal system to validate $header .= "POST /cgi-bin/webscr HTTP/1.1\r\n"; // HTTP1.1 Update $header .= "Content-Length: " . strlen($req) . "\r\n"; $header .= "Content-Type: application/x-www-form-urlencoded\r\n"; $header .= "Host: www.sandbox.paypal.com\r\n"; // Sandbox Host //$header .= "Host: ipnpb.paypal.com\r\n"; // Live Host $header .= "Connection: close\r\n\r\n"; </code></pre> <p>For further compatibility</p> <p><a href="https://ppmts.custhelp.com/app/answers/detail/a_id/926/" rel="nofollow">https://ppmts.custhelp.com/app/answers/detail/a_id/926/</a></p> <p>1) Your php script should also trim the IPN validation response.</p> <p>Modify your script:</p> <pre><code>//From: if (strcmp ($res, "VERIFIED") == 0) { .. else if (strcmp ($res, "INVALID") == 0) { //To: if (strcmp (trim($res), "VERIFIED") == 0) { .. else if (strcmp (trim($res), "INVALID") == 0) { </code></pre> <p>2) In php make sure the last line of your header includes double end-of-line markers: \r\n\r\n as in the example above: $header .="Connection: close\r\n\r\n";</p> <p>3) In php make sure to open the socket connection to the same host declared in the header. As your header is declaring the host as</p> <pre><code>$header .="Host: ipnpb.paypal.com\r\n"; </code></pre> <p>You should open the connection to the same host:</p> <pre><code>$fp = fsockopen ('ssl://ipnpb.paypal.com', 443, $errno, $errstr, 30); </code></pre>
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