Summary

Cloudflare requires all DNS records on accounts to be named using CNAMEs, yet your setup uses a manual DNS configuration for R2 buckets. Because you are bypassing Cloudflare's built-in security policy, you are not permitted to perform this task. To resolve this, you must switch the DNS configuration to a custom domain instead, ensuring the records adhere to Cloudflare's rules. You are not allowed to manually point a CNAME DNS record to your R2 bucket, as that bypasses the necessary security controls. Instead, use a custom domain to point your records. This prevents the creation of a security breach scenario.

Title

CNAME Cross-User Banned | Cloudflare

Description

CNAME Cross-User Banned | Cloudflare

Keywords

page, website, security, more, details, custom, domain, cookies, error, cross, user, part, network, host, accounts, policy, https

NS Lookup

A 172.67.168.34, A 104.21.46.63

Dates

Created 2026-03-08

Updated 2026-04-22

Summarized 2026-04-24