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For Webhosting packages with a CDN Plus package
How to activate the exclusive functions of CDN Plus powered by CloudFlare in 1&1 IONOS.
Click on CDN in the Hosting section for more performance.
In the line that lists the CDN plus package, click Enable.
Specify the domain for whose subdomains you want to activate the CDNpackage. Then select the desired subdomains.
Please note: The Content Delivery Network can only be activated for subdomains, not for the actual main domains. Please make sure that your website content is accessible via this subdomain(s).
Now click on Edit under General Settings. The individual functions are explained in the article General Settings for your CDNpackage.
Select the desired functions and then click Save.
This completes the activation of the CDN Plus package. The settings take effect within a few hours.