Renovar certificado

Buenas, no puedo regularizar mis certificados caducados. Del sitio domoticajsaiz2.duckdns.org
Al levantar el addon me sale el error:

[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] done.
[services.d] starting services
[services.d] done.

INFO: Using main config file /data/workdir/config

ERROR: Problem connecting to server (get for https://acme-v02.api.letsencrypt.org/directory; curl returned with 7)
[cmd] /run.sh exited 1
[cont-finish.d] executing container finish scripts...
[cont-finish.d] done.
[s6-finish] waiting for services.
[s6-finish] sending all processes the TERM signal.

Y cuando intento renovarlo me sale:

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