Cloudflare
2 verified issues
Let's Encrypt certificate renewal fails with DNS problem: NXDOMAIN
Certbot DNS-01 challenge renewal fails with 'DNS problem: NXDOMAIN'. The TXT record for _acme-challenge.example.com is visible in dig output from your local resolver but ACME validation still fails. Let's Encrypt uses Google's 8.8.8.8 and Cloudflare's 1.1.1.1 as DNS validators. These may see a different DNS state due to authoritative DNS replication lag or a previous cached NXDOMAIN response.
Nginx returns 413 Request Entity Too Large when uploading files
File uploads fail with HTTP 413 when the uploaded file exceeds Nginx's default client_max_body_size of 1MB. The error is returned by Nginx before the request even reaches the application server. This is a common issue in file upload features, avatar uploads, and document import APIs. The fix requires setting client_max_body_size in the Nginx config at the http, server, or location block level.