PHP try_files problem

fastcgi_params

fastcgi_param	QUERY_STRING		$query_string;
fastcgi_param	REQUEST_METHOD		$request_method;
fastcgi_param	CONTENT_TYPE		$content_type;
fastcgi_param	CONTENT_LENGTH		$content_length;

fastcgi_param	SCRIPT_FILENAME		$request_filename;
fastcgi_param	SCRIPT_NAME		$fastcgi_script_name;
fastcgi_param	REQUEST_URI		$request_uri;
fastcgi_param	DOCUMENT_URI		$document_uri;
fastcgi_param	DOCUMENT_ROOT		$document_root;
fastcgi_param	SERVER_PROTOCOL		$server_protocol;

fastcgi_param	GATEWAY_INTERFACE	CGI/1.1;
fastcgi_param	SERVER_SOFTWARE		nginx/$nginx_version;

fastcgi_param	REMOTE_ADDR		$remote_addr;
fastcgi_param	REMOTE_PORT		$remote_port;
fastcgi_param	SERVER_ADDR		$server_addr;
fastcgi_param	SERVER_PORT		$server_port;
fastcgi_param	SERVER_NAME		$server_name;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param	REDIRECT_STATUS		200;

site config

server {
  listen 80;
  server_name localhost;

  location / {
    root /srv/www/radiant/public;
    passenger_enabled on;
  }

  location /forum/ {
    alias /srv/www/forum/;
    index index.php index.html index.htm;

    # Ban internal files
    location ~ ^/forum/(config\.php|common\.php|includes|cache|files|store|images/avatars/upload) {
      deny all;
    }

    location ~ \.php$ {
      # Try to stop bad PHP requests
      try_files $uri =404;

      fastcgi_pass php-www;
      # Needed for PHP?
      # fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
      include fastcgi_params;
    }
  }
}

# Link to php5-fdm's default pool
upstream php-www {
  server unix:/var/run/php5-www.sock;
}

# Radiant takes a while to boot, get it started immediately
passenger_pre_start http://localhost/