Summary

A configuration error prevents Cloudflare from acting as a CNAME record across your Cloudflares accounts, rendering the service inaccessible by Cloudflare itself. The underlying security policy strictly forbids configuring CNAME DNS records for Cloudflares, and attempting to manually point a CNAME to your R2 bucket violates these security guidelines. Because manual CNAME points are not permitted in this context, you must use a custom domain to establish the correct connection, but the fundamental limitation is that the host must be configured as a CNAME across the platform's entire account network.

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 172.67.187.58, A 104.21.4.240

Dates

Created 2026-03-09

Updated 2026-04-15

Summarized 2026-04-16