Your DDNS provider is freedns.afraid.org
This issue has been covered in another post thread earlier today and also back on 10th March.
The post from earlier today is
https://community.ipfire.org/t/can-i-white-list-one-ip-so-it-do-not-get-drop-hostile/11535
and it has a link to the post thread from 10th March.
Those give more details and to prevent a third post thread running I will close this post. Please use the one from earlier today.