Cert is due for renewal, auto-renewing...
Plugins selected: Authenticator apache, Installer apache
Attempting to renew cert (wiki.flinfo.fr) from /etc/letsencrypt/renewal/wiki.flinfo.fr.conf produced an unexpected error: Failed to parse: https://acme-v02.api.letsencrypt.org/directory. Skipping.
This is an ACME Certificate Authority running Boulder.
This is a programmatic endpoint, an API for a computer to talk to. You should probably be using a specialized client to utilize the service, and not your web browser. See https://letsencrypt.org/docs for help.
Your success with curl shows that this is not an IP communication problem. I suggest you open a new topic and use the template to fully describe your errors.