configurations file names

Hi,
I have a configuration file called example.com,
that works.
It's stored in /etc/nginx/sites-available/example.com

I copied the example.com in dradamb.com,

Then I created a link to dradamb.com in sites-enabled,
and erased the link to example.com
but...
this new one doesn't work!!

The only difference seams to be the name.
Is it possible?

Andrea