Let's Encrypt problems with Cloudflare zones - cannot add new subdomains via CF DNS token

Hi everyone, I hope you can help me!

I was running a caddy reverse proxy for several self-hosted services on my server. Caddy got connection with Cloudflare using a Cloudflare_DNS_token. Even though it worked for a long time, a few weeks ago I started getting problems adding new subdomains. The old subdomains get recognised, but new ones do not, even though I’ve added a specific DNS entry for that subdomain. I even tried different reverse proxies (e.g. the new Cosmos Server container), but I either get rate-limited because an acme-challenge cannot be passed or some zone cannot be found, or, after trying again today, the ALPN protocol “acme-tls/1” cannot negotiate for the challenge. I am adding all three errors I usually get:

  1. There are errors with your Let's Encrypt configuration or one of your routes, please fix them as soon as possible.: - error: one or more domains had a problem: [*.domain.tld] [*.domain.tld] acme: error presenting token: cloudflare: could not find zone for domain "domain.tld" (_acme-challenge.domain.tld.): unexpected response code 'SERVFAIL' for _acme-challenge.domain.tld.

  2. - error: one or more domains had a problem: [*.domain.tld] [*.domain.tld] acme: error presenting token: cloudflare: could not find zone for domain "domain.tld" (domain.tld.): unexpected response code 'SERVFAIL' for domain.tld.

  3. There are errors with your Let's Encrypt configuration or one of your routes, please fix them as soon as possible.: - error: one or more domains had a problem: [*.domain.tld] [*.domain.tld] acme: error presenting token: cloudflare: could not find zone for domain "domain.tld" (domain.tld.): unexpected response code 'SERVFAIL' for domain.tld. [domain.tld] acme: error: 403 :: urn:ietf:params:acme:error:unauthorized :: Cannot negotiate ALPN protocol "acme-tls/1" for tls-alpn-01 challenge

Any idea what is going on? Google searches seem to imply that there is an issue with DNSSEC, but DNSSEC is disabled on Cloudflare. Attached you can see part of my DNS and token config.

Thank you for all the help you can give me!





This topic was automatically closed 15 days after the last reply. New replies are no longer allowed.