Fix · nginx
Fix “Certificate authority authorization (CAA)” on nginx
Add a CAA record, e.g.: yourdomain. CAA 0 issue "letsencrypt.org"
No server-level snippet for this control on nginx; apply the guidance below.
Verify the fix
Re-run the Certificate authority authorization (CAA) check after deploying. Test config changes in staging first and keep a rollback: a wrong header can break a site faster than a missing one.
Other stacks: Apache · Caddy · Express / Node · Cloudflare