grails - Paypal Sandbox IPN always fails -

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i'm developing grails app using http://grails.org/plugin/paypal plugin. i've followed instructions, configured app work dyndns (no-ip).

i can access app outside network. payment correct, if click on "back test's store" link returns site.

the problem no ipn sent ipn handler.

in ipn history can see transactions in error state, no http response code shown.

it retries 8 times each message.

notification url correct.

what else can try?

i answer myself,

looks paypal not send ipn posts url ports other 80 or 443


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