Znote AAC IPN not being received

[Tazzonny]

Points weren't being added after payments from paypal, found out I was receiving these from paypal
[using latest version of znote aac]

Hello,

Please check your server that handles PayPal Instant Payment Notification (IPN) messages. Messages sent to the following URL(s) are not being received:

http://xxx.xx.xxx.xx/ipn.php

If you do not recognize this URL, you may be using a service provider that is using IPN on your behalf. Please contact your service provider with the above information.

Once you or your service provider fix this problem, you or your service provider can resend the failed messages from the IPN History page. If this problem continues, PayPal may disable the IPN feature for your account.

Thank you for your prompt attention to this issue.

Thanks,

PayPal

and whenever i try to access the /ipn.php directly from browser I get

503 Service Unavailable
The server is temporarily busy, try again later!

here is a copy of ipn.php in case it might be necessary

<?php
    // Require the functions to connect to database and fetch config values
    require 'config.php';
    require 'engine/database/connect.php';
   
    // Fetch paypal configurations
    $paypal = $config['paypal'];
    $prices = $config['paypal_prices'];
   
    // 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);
   
    // assign posted variables to local variables
    $item_name = $_POST['item_name'];
    $item_number = $_POST['item_number'];
    $payment_status = $_POST['payment_status'];
    $payment_amount = $_POST['mc_gross'];
    $payment_currency = $_POST['mc_currency'];
    $txn_id = mysql_real_escape_string($_POST['txn_id']);
    $receiver_email = $_POST['receiver_email'];
    $payer_email = mysql_real_escape_string($_POST['payer_email']);
    $custom = $_POST['custom'];
   
    if (!$fp) {
        // HTTP ERROR
    } else {
        fputs ($fp, $header . $req);
        while (!feof($fp)) {
            $res = fgets ($fp, 1024);
            if (strcmp ($res, "VERIFIED") == 0) {
                if ($payment_status == 'Completed') {
                    $txn_id_check = mysql_query("SELECT `txn_id` FROM `znote_paypal` WHERE `txn_id`='$txn_id'");
                    if (mysql_num_rows($txn_id_check) != 1) {
                        if ($receiver_email == $paypal['email']) {
                           
                            $status = true;
                            $pieces = explode("!", $custom);
                            // TODO - fix this logic
                            // 0 = user_id, 1 = price, 2 = points
                            $f_user_id = (int)$pieces[0];
                            $f_price = (float)$pieces[1];
                            $f_points = (int)$pieces[2];
                            if ($payment_amount != $f_price) $status = false; // If he paid wrong ammount
                            if ($payment_currency != $paypal['currency']) $status = false; // If he paid using another currency
                           
                            // Verify that the user havent messed around with POST data
                            if ($status) {
                                $status = false;
                                foreach ($prices as $price => $points) {
                                    if ($price == $f_price && $points == $f_points) $status = true; // data does not appear to be manipulated.
                                }
                                if ($status) {
                                    // transaction log
                                    $log_query = mysql_query("INSERT INTO `znote_paypal` VALUES ('', '$txn_id', '$payer_email', '$f_user_id', '".(int)$f_price."', '".(int)$f_points."')");
                                   
                                    // Give points to user
                                    $old_points = mysql_result(mysql_query("SELECT `points` FROM `znote_accounts` WHERE `account_id`='$f_user_id';"), 0, 'points');
                                    $new_points = (int)$f_points;
                                    $new_points += $old_points;
                                    $update_account = mysql_query("UPDATE `znote_accounts` SET `points`='$new_points' WHERE `account_id`='$f_user_id'");
                                } else mysql_query("INSERT INTO `znote_paypal` VALUES ('', '$txn_id', 'ERROR: HACKER detected: $payer_email', '$f_user_id', '".(int)$f_price."', '".(int)$f_points."')");
                            }
                        }  else {
                            $pmail = $paypal['email'];
                            mysql_query("INSERT INTO `znote_paypal` VALUES ('', '$txn_id', 'ERROR: Wrong mail. Received: $receiver_email, configured: $pmail', '0', '0', '0')");
                        }
                    }
                }
            }
            else if (strcmp ($res, "INVALID") == 0) {
                // log for manual investigation
               
            }
        }
        fclose ($fp);
    }
?>

all help is appreciated, thanks in advance

 

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[Znote]

I have revised the paypal system, check Znote AAC 1.5_SVN from github