This guide explains how to troubleshoot issues you might encounter while using Universal CDN services.
Basic Checks:
I. Verify that your CDN services are active by gaining access to your account at my.ucdn.com. If your account has been suspended, a warning notice will appear in your CDN Control Panel.
In such cases, please Contact Us for assistance with reopening the account.
II. Verify that the content to cache is available on the origin server (if the content is stored at your own server) and if it’s accessible on the Internet.
The fastest way to do that is to open a browser in a private or incognito mode and browse directly to the file. Type or paste the URL into the address bar and verify that it results in the file you expect.
You can check what is the origin location specified for your CDN zone by clicking on the My Zones tab, then click on the cogwheel icon next to your zone, and navigate to the Main settings section in the CDN Control Panel at my.ucdn.com.
If your assets are stored in the Universal CDN storage container, verify that they are still located there.
To get your FTP credentials, follow the steps outlined below:
1. Log in to the Universal CDN Control Panel at my.ucdn.com.
2. Navigate to the Storage tab located in the top left corner.
3. Click on the key icon 
next to the Storage container.
III. Verify that the added CDN zone alias(es) (CNAME) are correctly configured.
Verify that your zone aliases (e.g. cdn.example.com) are pointed to the domain name assigned to your CDN zone (e.g. 11131-7.b.cdn12.com).
The following articles will help you to check if the resources of yours have been cached and served by the Universal CDN edge servers: