To improve security, Web Application Firewall (WAF) will require a small subset of users to verify domain ownership starting May 30, 2023. When you add a domain name to WAF in CNAME record mode in the WAF console, you may be required to use the following methods to verify your ownership of the domain name:
1. Modify the TXT record for a subdomain.
2. Upload an HTML file to the root directory of your website.
After you prove ownership of the domain name, you can add the domain name to WAF.

For further assistance, submit a ticket or call the service support hotline.
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