nginx/1.4.6 配置的虚拟主机访问提示“File not found”

查看日志tail /var/log/nginx/error.log，提示“primary script unknown while reading response header from upstream”

查看该虚拟主机的配置文件部分内容如下：

location ~ \.php {

#fastcgi_pass remote_php_ip:9000;

fastcgi_pass unix:/var/run/php5-fpm.sock;

fastcgi_index index.php;

include fastcgi_params;

set $real_script_name $fastcgi_script_name;

if ($fastcgi_script_name ~ "^(.+?\.php)(/.+)$") {

set $real_script_name $1;

set $path_info $2;

}

fastcgi_param SCRIPT_FILENAME $document_root$real_script_name;

fastcgi_param SCRIPT_NAME $real_script_name;

fastcgi_param PATH_INFO $path_info;

}

无奈拷贝安装nginx后有个缺省的配置文件default中的location部分，如下：

location ~ \.php$ {

fastcgi_split_path_info ^(.+\.php)(/.+)$;

# # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini

#

# # With php5-cgi alone:

# fastcgi_pass 127.0.0.1:9000;

# # With php5-fpm:

fastcgi_pass unix:/var/run/php5-fpm.sock;

fastcgi_index index.php;

include fastcgi_params;

}

重载nginx servcie nginx reload后问题解决，

谁能解释这是为什么？