Domain doesn't work, yes subdomains, why?.

Hi, i have a domain and some subdomains that works, but my domain doesn’t work. I don’t know the reason, my nginx config files are fine, The proof is that if they work subdomains, with the same file that domains!

My zone file:

$ORIGIN presentatenlaweb.com.
$TTL 1800
presentatenlaweb.com. IN SOA ns1.digitalocean.com. hostmaster.presentatenlaweb.com. 1442513568 10800 3600 604800 1800
presentatenlaweb.com. 1800 IN NS ns1.digitalocean.com.
presentatenlaweb.com. 1800 IN NS ns2.digitalocean.com.
presentatenlaweb.com. 1800 IN NS ns3.digitalocean.com.
eduktivo.presentatenlaweb.com. 1800 IN A 192.241.193.196

This is my nginx config file for the domain:

server {

        listen 80;
        listen [::]:80;
        server_name presentatenlaweb.com;
        root /var/www/presentatenlaweb.com;
        index index.php index.html index.htm index.nginx-debian.html;

#location / {
#try_files $uri $uri/ =404;
#}

        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_pass unix:/var/run/php5-fpm.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}