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A comment on Paypal has not been sending payment notifications to merchants. Parent comment

Re:Paypal has not been sending payment notifications to merc... by cpncrunch on Friday August 01, 2014 @12:53PM (#8121387)
Have you checked your web server logs? We had a problem a year ago where we were getting 403 errors (forbidden). It turns out that paypal's DNS was a bit screwy, so apache wasn't able to do a reverse dns lookup on the ip address, and it was therefore getting rejected by our server. I simply added the ip addresses of all of paypal's IPN servers to our Allow list, and we haven't missed any IPNs in the last year:

Allow from .paypal.com

Allow from 173.0.81.1

Allow from 173.0.81.33

Allow from 66.211.170.66

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