Unable recieve IPN for Dynamic DNS with Port forwarding in Paypal sandbox Environment

I have 'Seller Account' in Paypal sandbox environment and I configured the URL for listening the IPN messages from Paypal API. My Web server uses Dynamic DNS with Port forwarding. But I cannot get any notification messages from Paypal API while doing the pa开发者_运维问答yments. Is Paypal sandbox environment does not support for Dynamic DNS servers with Port forwarding?. And is there any configuration setting need to be done for receiving IPN notifications in Dynamic DNS server. Can anyone helped me to solve this problem

PayPal's IPN service requires a HTTP/1.1 200 OK response and ideally connect on port 80 (HTTP) or 443 (HTTPS). Anything else is bound to run into issues.

Use a service like IPN Relay http://ipnrelay.com/ It collects your IPNs for you and lets you collect them from within your LAN and redistribute them to your dev box just as if they came directly from PayPal.

You might be getting blocked by a firewall along the way. Make sure that you are able to receive inbound connections by checking FW logs and enabling inbound filters (or port redirection).

Alternately you can also try a different DDNS provider - try a free account maybe? Some listed here: http://dnslookup.me/dynamic-dns/