What are the typical troubleshooting steps if the DNS challenge fails?

If the DNS challenge fails, first verify that the TXT record created by Traefik is correctly propagated to your DNS server. You can use online DNS propagation checkers to confirm. Double-check the configuration of your `cloudflare-dnschallenge` middleware in Traefik for any errors. Ensure that Cloudflare is properly configured for DNS challenge verification, and that your domain is properly managed within Cloudflare. Also, check for any firewall restrictions that might be blocking the DNS resolution or the TXT record validation.