IPN Callback Issue

[CrispCrew]

It appears the last few days, PayPal has been acting weird. They keep issuing me the following warning but i've been using this addon for ages without issues, now all of the sudden they can't access my URL from time to time ( or so they claim they cant ).
Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing:

[daohoangson]

I have also received other reports regarding this issue here https://xenforo.com/community/posts/1193227, probably a PayPal issue? Let's just wait a few more days and see if the situation improves.

[CrispCrew]

Still continuing, any update on this issue? I am afraid we will lose IPN access soon and if we do, this would really screw me and my team.

[daohoangson]

Nothing yet @CrispCrew, are you still receiving notification email until today?

[CrispCrew]

Yep

[dopeideas]

Also encountering this issue. I believe most payments are going through but upgrades don’t execute.