Confirming that your CNAME has been installed
In a Unix System:
You can check your CNAME status by using the Linux command
You should see something similar to the example below:
cdn.yourdomain.com. 300 IN CNAME [CDN Resource ID].rsc.cdn77.org
In a Windows System:
Click on your Windows start button and type "cmd" in the box. A DOS window will open up. Type the command
Name: [CDN Resource ID].