IPN Issues for collecting payment

Now pay pal tells me there is a problem with the server. I call them up and they tell me its my problem.

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

https://crowdfundanydeal.com?f=paypal_ipn&funder_id=3905
https://crowdfundanydeal.com?f=paypal_ipn&funder_id=3906
https://crowdfundanydeal.com?f=paypal_ipn&funder_id=3919
https://crowdfundanydeal.com?f=paypal_ipn&funder_id=3928
https://crowdfundanydeal.com?f=paypal_ipn&funder_id=3933