Caddy behind Cloudflare: no information found to solve challenge for identifier

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1

1. The problem I’m having:

I’m using Caddy behind Cloudflare for several sites. It’s working well, but I noticed errors in Caddy’s log related to Let’s encrypt certificate renewal:

looking up info for HTTP challenge … no information found to solve challenge for identifier: example.com

The IP address in the remote_addr seems to belong to Cloudflare. Caddy’s certificate renewal process seems to be working fine. I’m guessing the errors can be ignored, but I wanted to document this and (ideally) get confirmation of my assessment.

Cloudflare configuration

  • SSL/TLS encryption mode: full /strict
  • DNS record: proxied

2. Error messages and/or full log output:

{"level":"error","ts":1700862640.86196,"logger":"http","msg":"looking up info for HTTP challenge","host":"helgeklein.com","remote_addr":"162.158.86.225:59234","user_agent":"Go-http-client/2.0","error":"no information found to solve challenge for identifier: helgeklein.com"}

3. Caddy version:

  • 2.7.5

5. Links to relevant resources:

I’ve seen these forum topics which are probably related:

2

Yeah, it’s harmless. It could be some rogue process downstream from you retrying challenges and never giving up or something. You can safely ignore those.

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