nginx+php 最近突然php文件打不开 报错404

server {
    listen 80;
    server_name _;
    access_log /data/wwwlogs/access_nginx.log combined;
    root /data/wwwroot/default;
    index index.html index.htm index.php;
    location /nginx_status {
        stub_status on;
        access_log off;
        allow 127.0.0.1;
        deny all;
        }
    location ~ [^/]\.php(/|$) {
        #fastcgi_pass remote_php_ip:9000;
        fastcgi_pass unix:/dev/shm/php-cgi.sock;
        fastcgi_index index.php;
        include fastcgi.conf;
        }
    location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|flv|ico)$ {
        expires 30d;
        access_log off;
        }
    location ~ .*\.(js|css)?$ {
        expires 7d;
        access_log off;
        }
    }

 
fastcgi.conf
fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
fastcgi_param  QUERY_STRING       $query_string;
fastcgi_param  REQUEST_METHOD     $request_method;
fastcgi_param  CONTENYPE       $content_type;
fastcgi_param  CONTENT_LENGTH     $content_length;

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  REQUEST_SCHEME     $scheme;
fastcgi_param  HTTPS              $https if_not_empty;

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;
# netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      1727/mysqld         
tcp        0      0 127.0.0.1:6379          0.0.0.0:*               LISTEN      1808/redis-server 1
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      6079/nginx: master  
tcp        0      0 0.0.0.0:21              0.0.0.0:*               LISTEN      1812/pure-ftpd (SER
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      867/sshd            
tcp6       0      0 :::21                   :::*                    LISTEN      1812/pure-ftpd (SER
 
初学者 希望帮忙解答下