I am having trouble understanding why this happens: If I attach an ip address to the listen directives the server_name directive is ignored and it becomes the default server config for all vhosts even though it has a server_name directive.

Here is the config:

server {
listen ramnode:80 ;

root /usr/share/nginx/files;
index index.html index.htm;

# Make site accessible from http://localhost/
server_name files.kiwiheretic.com;

location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ =404;
# Uncomment to enable naxsi on this location
# include /etc/nginx/naxsi.rules
}

}

"ramnode" is defined in /etc/hosts as:

168.235.86.70 ramnode

If I remove "ramnode" from the listen directive all works. If its included none of my other domains work (with separate server blocks not shown here). Any ideas why?

Thanks in advance.