With my current configuration below the IP address is not appearing properly in Wordpress.

In the fastcgi.conf I have:

fastcgi_param REMOTE_ADDR $remote_addr;

In the nginx.conf I have:

upstream php {
server 127.0.0.1:9000;
}

location ~ \.php$ {
fastcgi_split_path_info ^(.+\.php)(/.+)$;
include fastcgi.conf;
fastcgi_intercept_errors off;
fastcgi_pass php;
}

cgi.fix_pathinfo = 0; in php.ini

With this I got a blank page when submitting a comment.

I tried adding

fastcgi_pass_header Host;
fastcgi_pass_header X-Real-IP;
fastcgi_pass_header X-Forwarded-For;

Now I get 502 Bad Gateway (Nginx).

What am I missing?