Varnish on Nginx not working

Question

I am trying to configure Varnish on Nginx web server.

Varnish Configuration

In the file /etc/varnish/default.vcl

vcl 4.0;

backend default {
    .host = "127.0.0.1";
    .port = "8080";
}

sub vcl_recv {

}

sub vcl_backend_response {
        set beresp.ttl = 10s;
        set beresp.grace = 1h;
}

sub vcl_deliver {

}

In the file /etc/default/varnish

START=yes

NFILES=131072

MEMLOCK=82000


DAEMON_OPTS="-a :80 \
             -T localhost:6082 \
             -f /etc/varnish/default.vcl \
             -S /etc/varnish/secret \
             -s malloc,256m"

Nginx Configuration

In the virtual host file /etc/nginx/sites-enabled/domain

server {
    listen 8080;

    root /var/www/html/domain.com/public_html;

    index index.html index.htm index.php;

    server_name domain.com www.domain.com;
    include hhvm.conf;

    location / {
        # First attempt to serve request as file, then
        # as directory, then fall back to displaying a 404.
        try_files $uri $uri/ =404;
    }

}

This configuration is not working. When I open domain.com on web browser the site does not show anything, but web I open domain.com:8080 website works.

When I changed port to listen 80 in virtual host, then domain.com works but Varnish is not working on both port 80 and 8080.

Result After running curl -I on both port

Result After running curl -I on both port

How can I fix this.