PayPal Instant Payment Notification Disabled‏?

[ChuckRock]

I just started using this plugin and it seem to be working. I had my first subscription parched yesterday and got this message from Paypal.

Please check your server that handles PayPal Instant Payment Notification (IPN) messages. Messages sent to the following URL(s) are not being received:

http://wallpaper.oceanmoon.com/?s2membe ... l_notify=1

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.

Not sure what to check at this point. The user was subscribed and shows up in my Paypal account.

Thanks for the help.
Chuck