External Subdomain to directory in my droplet

Well…

I have my domain primarysite.com of my droplet…i create a directory /livezilla/…

I want add a external subdomain to this directory:

I have in: /etc/nginx/sites-avaliable:

primarysite.com:

server {
        listen 80 default_server;
        listen [::]:80 default_server ipv6only=on;

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

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

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

AND

subdomain.external.com:

server {
        listen 80;
        listen [::]:80;
        server_name www.subdomain.external.com subdomain.external.com;
        root /usr/share/nginx/html/livezilla/;
        index index.php index.html index.htm;
}

After :

ln -s /etc/nginx/sites-available/subdomain.external.com /etc/nginx/sites-enabled/subdomain.external.com

and

ln -s /etc/nginx/sites-available/primarysite.com /etc/nginx/sites-enabled/primarysite.com

service nginx restart

[OK]…

but doens’t work…

Just primarysite.com works…

I forgot something?