I have the same issue with an app that has been working for 2+ years. Sandbox transactions fail with a Error 403 aswell. Not sure what they did to IPN, or where I can get infos. Everything seems a bit broken at this point (Sandbox pages loading without CSS, contradictory transaction status, faulty URLs, etc).
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Is there a community based or open sourced tester for the paypal IPN system? The official one is worthless and broken often, as it is now. I need to send some tests through the IPN sytems... live payments work but I just dont want to go in blind. Or... perhaps if anyone knows a paypal alternative for IPN that isn't flakey on the testing side, please post them.
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