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Paypal - IPN Delivery Failed

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I have been receiving alot of emails from Paypal with the following message:
Quote:

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

Code:
https://www.mysite.com/clients/modul...ack/paypal.php
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.
For some reason, this happened from nowhere, I haven't changed anything on the server...

I already checked ModSecurity and there is nothing blocking it, tried to change the permissions, and when I use the Paypal IPN simulator I get this message:
Quote:

We could not send an IPN due to an HTTP error: 406: Not Acceptable
I tried to upload a new paypal.php file, but still not working.

Anyone can give me some light on this? :(

Thank you

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