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It's been a long time since we've seen this but on Thursday 28/09 and again today we are seeing IPNs being significantly delayed.
This is intermittent - some are getting through - but most aren't and https://www.paypal.com/merchantnotification/ipn/history now shows lots of IPNs still retrying.
We have checked that we are not blocking any of PayPal's IP address ranges https://www.paypal.com/us/selfhelp/article/what-are-the-ip-addresses-for-live-paypal-servers-ts1056 so it's not that.
All the IPNs we are seeing are coming from [removed], which has been the pattern for a long time, and when we look at the IPN history it's showing that those that did succeed often only did so after retries.
Anyone else seeing this? Any thoughts?
TIA
Paul