Paypal Standard - Could not verify the PayPal transaction. Please try again. in PayPal Posted August 8, 2014 In the PayPal Account settings used for our demo site, the IPN settings are disabled so there isn't a need to enable it manually. You mentioned previously that PayPal notified you of IPN errors - are you still getting these notifications? If you don't see the IPN request coming in in your web server access logs, perhaps this is why: 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. Maybe you need to contact them and state that the problem has been fixed?