Block direct IP visit

# Step 1: 
# create a new file under a certain path (e.g. /etc/conf.d/) as below:


server {
    listen 80 default_server;
    server_name _;

    return 444;
}


server {
    listen 443 ssl default_server;
    server_name _;

    ssl_certificate     /etc/nginx/dummy.pem;
    ssl_certificate_key /etc/nginx/dummy.key;

    return 444;
}

#Step 2:
# generate dummy.pem dummy.key as below:

sudo openssl req -x509 -nodes -days 365 \
 -newkey rsa:2048 \
 -keyout /etc/nginx/dummy.key \
 -out /etc/nginx/dummy.pem \
 -subj "/CN=localhost"

#Step 3: 
sudo nginx -t
sudo systemctl reload nginx