Empty Page. NGINX ALIAS

I am trying to set an alias in my nginx but I obtein an empty white page.

There is my /etc/nginx/sites-available/default file:

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

root /var/www/html;
index index.php index.html index.htm;

server_name agitarycompartir.com;

location / {
    try_files $uri $uri/ /index.php?$args;
}

error_page 404 /404.html;
error_page 500 502 503 504 /50x.html;
location = /50x.html {
    root /var/www/html/;
}

location ~ \.php$ {
    try_files $uri =404;
   fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass unix:/var/run/php5-fpm.sock;
    fastcgi_index index.php;
    include fastcgi_params;
}
  location /demo {
root /var/www/phpmyadmin/;
  }
}

And there is my url for the alias: http://ift.tt/1vHKLYM

I tried switching to 777 permision and same issue...

Thank you in advance