nginx. How to ban other domains?

Question

Nginx

I bought vps, raised nginx and the aaa.ru site,
apparently, this ip already belonged to someone and the bbb.com and ccc.net domains refer to it
how to make my site open when aaa.ru is opened, and the rest is a blank page or 403/404?
Thank you

Answer 1

More or less like this

server {
root /var/www/путь к заглушке/; 
}

server {
     server_name  aaa.ru www.aaa.ru;
#    Настройки вашего домена
}

Answer 2

server { 
listen 80 default; 
return 403;
}

And better so.