Hi, I don't understand what's below. It appears that the default is not checked off. So does that mean that it's disabled or enabled if I put a checkmark in the box? I'm unclear on what the instructions mean below. Disable IPN verification Usually you DO NOT NEED to enable this option. However, on some webhostings PHP scripts are not allowed to contact external web sites. It breaks functionality of the PayPal payment integration plugin, and aMember Pro then is unable to contact PayPal to verify that incoming IPN post is genuine. In this case, AS TEMPORARY SOLUTION, you can enable this option to don't contact PayPal server for verification. However, in this case "hackers" can signup on your site without actual payment. So if you have enabled this option, contact your webhost and ask them to open outgoing connections to www.paypal.com port 80 ASAP, then disable this option to make your site secure again.