Certbot failed to renew my cert

[Osiris]

A few things:

@ocayatte

--force-renewal

Please don't use this option if you don't understand it. Better even: never use any option you don't understand. --force-renewal won't magically renew a certificate if there is an issue with issuance to begin with.

@ocayatte

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): 0.23.0

Certbot 0.23.0 is VERY old. Please update your Certbot.

@ocayatte

(…) acme-v01.api.letsencrypt.org (…) Name or service not known (…)

The ACMEv1 API is down for a long time now. Thus it makes sense you're getting a DNS error: the hostname doesn't exist any longer.

I believe modern Certbots can handle this automatically. Please update Certbot and check if renewal works again.