The release of new rules in the CIS WAF Managed Ruleset resulted in blocking data transmission for business operations. Since the WAF Managed Ruleset follows Cloudflare’s releases, if operators do not override the rules, they will automatically sw...
Although Cloudflare can customize error pages, but CIS(Cloud Internet Service) can't customize the error page. (like 1006 error page) .
https://support.cloudflare.com/hc/en-us/articles/200172706-How-do-I-customize-Cloudflare-error-pages-