I'm developing a grails app using http://grails.org/plugin/paypal plugin. I've followed all instructions, configured my app to work with a dyndns (no-ip).
I can access my app from outside my network. All the payment is correct, if I click on the "back to test's store" link it returns to my site.
The problem is that no IPN are sent to my IPN handler.
In the IPN history I can see all transactions in error state, but no http response code is shown.
It retries 8 times each message.
Notification URL is correct.
What else can I try?
I answer myself,
looks like paypal does not send IPN posts to URL with ports other than 80 or 443