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copied!<p>Change this: </p> <pre><code>// post back to PayPal system to validate $header .= "POST /cgi-bin/webscr HTTP/1.1\r\n"; $header .= "Content-Type: application/x-www-form-urlencoded\r\n"; $header .= "Host: www.paypal.com\r\n"; $header .= "Content-Length: " . strlen($req) . "\r\n\r\n"; $fp = fsockopen ('www.paypal.com', 80, $errno, $errstr, 30); #I also tried: $fp =fsockopen('ssl://www.paypal.com',443,$err_num,$err_str,30); </code></pre> <p>To this:</p> <pre><code>// post back to PayPal system to validate $header .= "POST /cgi-bin/webscr HTTP/1.1\r\n"; $header .= "Content-Type: application/x-www-form-urlencoded\r\n"; $header .= "Host: www.paypal.com\r\n"; $header .= "Content-Length: " . strlen($req) . "\r\n"; $header .= "Connection: close\r\n\r\n"; $fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30); </code></pre> <p>And this: </p> <pre><code>if (strcmp ($res, 'VERIFIED') == 0) { </code></pre> <p>To this: </p> <pre><code>if (strcmp (trim($res), 'VERIFIED') == 0) { </code></pre> <p>And it's pretty much guaranteed to work. </p> <p>Your current setup fails because PayPal sends a Connection: keep-alive header in the response which fsockopen gladly accepts, and thus it keeps the connection open.<br> Whereas a HTTP library such as cURL will close the connection automatically. </p> <p>My general suggestion is; if you don't want to control every single bit that goes across the line to PayPal, use a HTTP library such as cURL, rather than fsockopen which is just a plain TCP connection.<br> (PayPal has sample code using cURL available at <a href="https://www.paypal.com/ipn" rel="noreferrer">https://www.paypal.com/ipn</a> and <a href="https://www.paypal.com/pdt" rel="noreferrer">https://www.paypal.com/pdt</a>)</p>

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