Hello Paypal has finally come out with some information. Issue here is at 2 levels. 1) Some websites are blocked at security level by them , so, ones who are testing via Paypal Simulator page ( https://developer.paypal.com/dashboard/ipnSimulator ) are also getting IPN Failed , handshake issues This is because of new found stupid method , where paypal partner ( They are promoting) https://www.paloaltonetworks.com/ , needs to have correct category registered for your website. If they fail to find category via bots , they are marking sites as Malware. So, firstly you would need to visit ( As per email received from paypal support ) * Visit https://urlfiltering.paloaltonetworks.com/query/ and enter your IPN URL listeners that are not working and search. * You might be able to see that the results suggest that there is some malware. * Click on "Request Change" and provide some comments showing that * The Website URL/Domain is in good health and not servicing content unexpectedly. * The Website URL/Domain is classified appropriately via 3rd party domain/URL filtering products. So, once you have done it , in 2-3 hours paypal simulator page will start to allow IPN handshake. How stupid is it .. this way this company gets our emails and would start bombarding us to purchase their software for security . Also, how stupid this method is. 2) Now coming to issue 2. People whose websites are clearly categorized and not receiving IPN in actual ( Like me ) , but getting IPN Sent correctly via simulator of paypal , have to keep pushing paypal to resolve issue.
... View more