Nginx said "The page you are looking for is temporarily unavailable."

[sailershen]

I use apache+php+mysql as web server on port 8080, and run nginx as front proxy on port 80, in nginx.conf:

      location / {
            proxy_pass   http://www.abc.com:8080;
            proxy_set_header  X-Real-IP  $remote_addr;
        }
         client_max_body_size             50m;
         client_body_buffer_size        256k;
         client_header_timeout     3m;
         client_body_timeout 3m;
         send_timeout             3m;
         sendfile on;
         tcp_nopush         on;
         keepalive_timeout 300;
         tcp_nodelay on;


When I access www.abc.com:80, sometimes it will said:

The page you are looking for is temporarily unavailable.

Please try again later.  


I don't know why, who can help me?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,4772,4772#msg-4772