Nginx monitored two ports 80 and 81, but I can not find the configuration of 81!!

Nginx.conf inside.

HTTP {

### Virtual Host Configs##include /etc/nginx/conf.d/*.conf;include /etc/nginx/sites-enabled/*;

}

CONF.D is empty ...

Sites-enabled

And then the default file inside

server {

listen 80 default_server;listen [::]:80 default_server;

root /data/www/;# Add index.php to the list if you are using PHPindex index.html index.htm index.php;server_name _;location / {    # First attempt to serve request as file, then    # as directory, then fall back to displaying a 404.    try_files $uri $uri/ =404;}# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000#location ~ \.php$ {    include snippets/fastcgi-php.conf;##    # With php5-cgi alone:    fastcgi_pass 127.0.0.1:9000;#    # With php5-fpm:#    fastcgi_pass unix:/var/run/php5-fpm.sock;}# deny access to .htaccess files, if Apache's document root# concurs with nginx's one##location ~ /\.ht {#    deny all;#}

}
I didn't even see the 81 word.

