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Hi my paypal Instant Payment Notification (IPN) history keep showing Status Retrying since yesterday, had check the backend of our webstore which uses opencart was running fine..Thanks and any advise would help?
We have had the same issue. Starting 2/17 all IPN messages were failing with a '503', and a look in IPN History, shows them in a 'Retrying' status. We checked our back-end, and everything we could think of and could find no problem with our long running IPN script. Then today, we magically started successfully receiving IPN messages again. We had opened a technical support ticket with PayPal, but it remains unopened after 2 days (super).
We started successfully receiving IPN messages again on 2/19 and things have been working fine since. PayPal Support finally responded to our support ticket a day and a half after we submitted it, but by then things were working again, so they did not offer any real help.
From our postmortem review on this issue, we noticed that our IPN Notification URL was set up in PayPal as 'http://...', so we changed this to 'https://...', and all IPN messages from this point on were successfully sent to us (200). We do not know with high confidence that this change fixed the issue as it may have been coincidental, but there you are.
If in fact, PayPal made a change that all Notification URL's must now be to 'https://...', obviously, that would have been highly beneficial to know in advance,
Check your firewall. We created a support ticket for our hosting company to see if PayPal IP addresses were being blocked. We never got a clear answer on what exactly they did, but we suspected that may have been the root cause.