This didn't work.
proxy_set_header Host $proxy_host;
next try
proxy_set_header Host $http_host:8080;
added #proxy_set_header Connection close; //or

location / {
root /var/www/demo;
index index.html index.htm default.aspx Default.aspx;

proxy_set_header Host $proxy_host;
#proxy_set_header Connection close;

include /etc/nginx/fastcgi_params;
fastcgi_index Default.aspx;
fastcgi_pass 127.0.0.1:9000;
}
}