PayPal Instant Payment Notification Warning

I was just wondering if anyone else has received the following notification from Paypal; what it could mean, and how I can resolve it.

Dear My Name,

Please check your server that handles PayPal Instant Payment Notifications (IPN). Instant Payment Notifications sent to the following URL(s) are failing:

www.mywebsite.com/index.php?option=com_o...ent_method=os_paypal

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. If this problem continues, IPNs may be disabled for your account.

Thank you for your prompt attention to this issue.

Hi

That mean Paypal IPN message is blocked for some reasons or maybe the Paypal IPN handles is wrong. In the past, I think Membership Pro has the issue with recurring subscription, so maybe you can download latest version of Membership Pro, upgrade it to your site and It will solve this issue

Regards,

Tuan