Summary

Cloudflare security policy prohibits CNAME DNS records configured across multiple Cloudflare accounts. If you've manually set up a CNAME record to point to your R2 bucket, you should use a custom domain instead.

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 104.18.20.156, A 104.18.21.156

Dates

Created 2026-02-15

Updated 2026-02-15

Summarized 2026-03-01