#nginx #apache #clean-url

i'm trying to make a nginx as a proxy of apache, when the clean-url is on, i upload a image to a field, the thumbnails is not generated. I had read all of the thread around the google and tried every solutions but not work, here is my nginx vhost file

server {

 listen 80;
 server_name www.example.com example.com;
 access_log /var/log/virtualmin/example.com_nginx_access_log;
 error_log /var/log/virtualmin/example.com_nginx_error_log;
 location / {
 index index.php;
proxy_pass http://192.168.1.104:8086;
 include /etc/nginx/proxy.conf;