Paypal IPN problem

Payment is fine. Paypal IPN History shows ?Sent?

When payment is done and paypal back me to my success page, received firefox bug:


When I click "continue", Paypal send request to ipn.php
ipn.php doesn't create ipn_errors.log , maybe hosting doesnt allow ...

But ipn.php doesn't work, because MySql doesn't update. It's posible $verified variable to be empty?

I used for guide:
https://github.com/Quixotix/PHP-PayPal-IPN

<?php


mysql_connect("localhost", "user", "password") or die(mysql_error());
mysql_select_db("PayPal") or die(mysql_error());


// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$req .= "&$key=$value";
}
// post back to PayPal system to validate
$header = "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";


$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);
if (!$fp) {
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
if (strcmp ($res, "VERIFIED") == 0) {


// PAYMENT VALIDATED & VERIFIED!


}


else if (strcmp ($res, "INVALID") == 0) {


// PAYMENT INVALID & INVESTIGATE MANUALY!


}
}
fclose ($fp);
}
?>


maybe it helps you.