Siriproxy & dyndns not working

[nixiam]

Hi guys,
I am an Italian guy and I recently installed SiriProxy on my pc. He works perfectly even 3g but when I replace my IP with the address of my dyndsn url, the server does not receive more requests. I have also tried to replace the certificate by following the instructions of the post "https://gist.github.com/chuchomtz/1558903" but it does not work.
I am registered on the site dyndns.it but I also tried to register to no-ip.com but does not work any way.
If replace my hostname with my current public IP address it all back to work.

Can anyone help me?
Sorry for my bad english: P

Thank you