nemoprofeta on "[Plugin: W3 Total Cache] "Unable to resolve hostname" on 1 of 3 sites"

I just switched to Amazon Cloudfront for my 3 sites. All of them have w3tc installed and I have configured them in the same way.
The problem is when it comes to adding CNAMEs. For each site I created 4 CNAMEs to add to w3tc CDN settings. The first two sites work correctly and I checked that resources are loading from different domains.
The site apprendistapasticcere.it works only if I use the original Cloudfront domain name. If I test any of the CNAMEs I created for this site, I get the "Unable to resolve hostname" error.
The CNAMEs are cdn1.apprensitapasticcere.it, cdn2.apprensitapasticcere.it,
cdn3.apprensitapasticcere.it, cdn4.apprensitapasticcere.it.
Why only this site isn't working?

http://wordpress.org/extend/plugins/w3-total-cache/