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Earlier I was facing PayPal IPN postback failure issue in my Magento store version 1.5.1.0 I am using Paypal Website Payment standard method.

I have fixed this issue using link http://www.dhmedia.com.au/article/debugging-paypal-ipn-postback-failures-magento

Now from few days back I started getting same issue again for some paypal orders and it is quite random, for some users it is coming and for others it is working fine.
Also we are using SSL on our store.

What can be the probable issues and how can I track this?

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  • Check you access.log whether there was a request. And the config of your firewall. I heard about problems with paypal not sending IPNs. Beside of this you should really update. Magento 1.5 has a lot of bugs, especially security bugs! Mar 11, 2014 at 9:34
  • @Fabian -- I guess I need to check server access log that was there any response from Paypal or not. Am I correct? Mar 11, 2014 at 10:36
  • Exactly, I would start there. Mar 11, 2014 at 11:40
  • I have checked server logs but there is nothing related to this error. There are no error or exception generated due to paypal. Mar 11, 2014 at 13:10
  • 2
    Might be a long shot but try upping your PHP config's max_input_vars from 1000 to 3000. The default of 1000 can sometimes truncate the IPN response from PayPal.
    – CVEEP
    Mar 13, 2014 at 22:59

2 Answers 2

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The easiest solution to this issue with Paypal IPN is to use this extension:

http://www.magentocommerce.com/magento-connect/mage-paypal-ipn-notification-alerts.html

Ensure to follow the instructions after installation to change your PayPal IPN address to:

http://www.YOURSTORENAMEHERE.com/paypalipn/ipnlistener.php

in your Paypal settings.

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PayPal is currently trying to get all merchants off of PayPal IPN and Website Payments Standard and switch to an API based extension like PayPal Express. You might want to give that a try.

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