This is my nginx config

server {
 listen blog.ultraera.org:80;
 server_name blog.ultraera.org;

 location / {
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header Host $http_host;
  proxy_pass   http://127.0.0.1:2368;
 }
}

server {
 listen piwik.ultraera.org:80;
 server_name piwik.ultraera.org;

 location / {
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header Host $http_host;
  proxy_pass   http://127.0.0.1:2080;
 }
}