When Alibaba Cloud CDN is used, after the first-level domain name test.com and second-level domain name www.test.com are resolved, test.com can be accessed whereas www.test.com cannot be accessed. Both domains can be accessed after they are bound to the origin site.
The resolution results show that the two domain names are resolved to the same CNAME: test.com.w.alikunlun.com.
Each CNAME maps a domain name, which must not be resolved to other CNAMEs.
Resolve the CNAME of the second-level domain www.test.com to www.test.com.w.alikunlun.com. Then the domain will be accessible.
If the problem persists, contact Alibaba Cloud After-Sales Technical Support.