Reverse proxy

I want to run nginx as reverse proxy for apache2 on my server but virtualmin always make my configurations to fail !

Steps :

1- Install nginx using it's official repo : http://nginx.org/en/download.html

2- Use this config file for nginx :

server {
    listen 80;
    server_name _;
    root /var/www;
    client_max_body_size 20M;
 
    location / {
        access_log      off;
        proxy_pass http://127.0.0.1:81;
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_read_timeout 120;
        proxy_connect_timeout 120;
    }
}

3- Install rpaf_module for apache : http://stderr.net/apache/rpaf/download/

4- Add the following config file for rpaf config : /etc/httpd/conf.d/rpaf.conf

LoadModule rpaf_module        /usr/lib/httpd/modules/mod_rpaf-2.0.so
RPAFenable On
RPAFsethostname On
RPAFproxy_ips 127.0.0.1
RPAFheader X-Forwarded-For

5- Alter the following lines in apache config file : /etc/httpd/conf/httpd.conf :

Listen 127.0.0.1:81
NameVirtualHost 127.0.0.1:81

6- Change virtualmin configuration to use 127.0.0.1 and port 81 as default virtualserver config. /etc/webmin/virtual-server/config

web_port=81
dns_ip=
defip=127.0.0.1

The problem is just with step 6, virtualmin could understand that use 127.0.0.1 just for virtualserver IP, not for bind zone file !!

It also returns some error about non-matching IP addresses in Validate virtual-server section.

Please add this nice feature to virtualmin.