I'm using KeliWeb CDN and I've experienced a problem.
After having set Magento like in these pictures (https://www.keliweb.it/images/new013/cdn/guide/magento/magento2_thumb.png and https://www.keliweb.it/images/new013/cdn/guide/magento/magento3_thumb.png)
I noticed that all the images in the site appears to be down.
The src url was like
http://cdn.domain.com/media/path/to/image.jpg, so was correct.
The backend starts to be not clickable, so via phpMyAdmin i restore default configuration, stripping out all CDN modification just done and all worked.
How to make the CDN work in Magento? I've set CDN and done the same procedure with few Magentos and all worked fine. Am I missing something? My reference is: https://www.keliweb.com/cdn/come-ottimizzare-magento.php