Duckdns and ios connection problems


After installing duckdns I can’t connect through the ios app, I get a message “unknown error”, the strange thing is that it works fine through the browser.

some ideas?

here is the configuration

#api_password: !secret http_password
ssl_certificate: /ssl/fullchain.pem
ssl_key: /ssl/privkey.pem

Duckdns settings

“lets_encrypt”: {
“accept_terms”: true,
“certfile”: “fullchain.pem”,
“keyfile”: “privkey.pem”
“token”: “xxxxxxxxxxx”,
“domains”: [
“seconds”: 300

I found the problem. The problem was the port number in “base_url:
after removing it it works.