Error renewing certificate from Let's Encrypt - i/o timeout

Traefik Traefik v1
,
1

Hi everyone,

Here another one with Let's Encrypt certificates renewal errors. It's been working for long time, but suddenly it stopped. The Traefik is built in a digitalocean server with docker. The error msg is the following:

time="2024-06-20T06:38:18Z" level=info msg="Error renewing certificate from LE : {Main:admin.escuelaideo.edu.es SANs:}, get directory at 'https://acme-v02.api.letsencrypt.org/directory': Get "https://acme-v02.api.letsencrypt.org/directory\": dial tcp: lookup acme-v02.api.letsencrypt.org on 127.0.0.11:53: read udp 127.0.0.1:49664->127.0.0.11:53: i/o timeout"

Checking other answers as the next one (Error renewing certificate from LE - i/o timeout), I realize it could be a DNS problem (NS records are set to digitalocean's ones), but none of the proposed solutions works. Curl-ing the directory, I have a correct answer.

Any new idea to check?

Thanks!