Nginx service start failure in CentOS 5.5 -

i installed nginx in centos 5.5 using yum nginx repo.

after installation, in service stopped status. want start nginx service , configure started @ boot time. before starting service, created new ssl configuration in /etc/nginx/conf.d/ssl.conf

on third line of configuration file, set server name follow:

server_name   {{ www_name }}; 

i executed following commands in terminal:

$ chkconfig nginx on $ service nginx start 

chkconfig command got executed successfully, service start command gives me following error:

starting nginx: nginx: [emerg] directive "server_name" not terminated ";" in /etc/nginx/conf.d/ssl.conf:3

this how ssl.conf looks like:

server {
listen 443 default_server;
server_name {{ www_name }};
underscores_in_headers on;
ssl on;
ssl_certificate cert.pem;
ssl_certificate_key cert.key;
...
}

this link explains solution, can't understand. surprisingly, else used ssl.conf file before on centos, somewhere else , did not change anything!

{{ www_name }} not valid entry. need use domain name string or regex. link provided shows valid examples.