Paypal IPN Issue

[Mudassir]

Dear all,
I have an application which processes online payments. there are also some monthly subscriptions. I have set an IPN listener on my web server. Every time a transaction goes through, paypal sends a notification to the url set in IPN settings in paypal account. However, when a subscription is renewed, no notification is sent. Does paypal really send notification when subscription is renewed the next month ?

Regards,

[Kajaria]

dont' have better idea about VPN. I only use skrill for transaction.