The time it takes for the CNAME record to take effect depends on the DNS provider. Open the command line interface that comes with Windows and run the following command:

nslookup -qt=cname Acceleration domain name

If the CNAME record is displayed, the CNAME record has taken effect.

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1. Check whether the primary and standby origin servers are normal by referring to How Do I Check Whether an Access Fault Is Caused by the CDN Node or Origin Server?

2. If the origin servers are normal but the fault persists, submit a service ticket.

Cached content on CDN nodes is not updated in real time. CDN nodes only retrieve new content from the origin server when the previously cached content expires. If you want to update content cached on CDN nodes, configure cache rules or submit cache refreshing or cache preheating tasks. For details, see Cache Rules.

• Cache refreshing

After you submit a cache refreshing request, cached content on CDN nodes will be forcibly expired. If a user requests that content, CDN will retrieve fresh content from the origin server and then cache the new content.

• Cache preheating

After you submit a cache preheating request, the origin server proactively sends the most current content to a CDN node for caching. If a user requests the content, the CDN node immediately returns the cached content. It does not retrieve any new content.

Yes.

HTTPS secure acceleration can be used to prevent content hijacking. For details about how to configure HTTPS, see HTTPS Settings. However, if domain hijacking occurs before accessing the CDN service, CDN cannot detect it.

Online preview is not enabled. To enable it, log in to the CDN console, choose Domains in the navigation pane, click the target domain name, click the Advanced Settings tab, and set Content-Disposition to inline.

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CDN is billed based on the used traffic or bandwidth, regardless of the acceleration service types. For details, see Billing.

Yes.

When adding a domain name, set the service area to Global.

If the service area of your domain name is Chinese mainland, obtain an ICP license from the MIIT before using CDN. If the service area of your domain name is Global (Chinese mainland not included), the ICP license is not required before using CDN.