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.
Thank you for your prompt attention to this issue.
If not then it sounds like someone set up your PayPal account to use it in the past and the page PayPal is now checking no longer loads (the link above) due to an issue with your SSL certificate.
The domain in that link, is that a previous domain which is no longer used?
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Support forum for Event Espresso 3 and Event Espresso 4.