[error] 28068#0: *593102 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.1.21, server:
www.xxxx.com, request: "POST /ep.php HTTP/1.1", upstream: "fastcgi://unix:/dev/shm/php-cgi.sock:", host: "www.xxxxx.com"此问题在于，nginx的buffer太小了，timeout太小了。在nginx配置文件目录grep buffer * -irn、grep timeout * -irn，然后把所有的buffer加倍，改完之后的效果如下：
nginx.conf:18: client_header_buffer_size 64k;
nginx.conf:19: large_client_header_buffers 4 64k;
nginx.conf:21: client_body_buffer_size 20m;
nginx.conf:31: fastcgi_buffer_size 128k;
nginx.conf:32: fastcgi_buffers 4 128k;
nginx.conf:33: fastcgi_busy_buffers_size 256k;
nginx.conf:39: gzip_buffers 16 8k;
proxy.conf:4:proxy_buffer_size 64k;
proxy.conf:5:proxy_buffers 4 128k;
proxy.conf:6:proxy_busy_buffers_size 256k;nginx.conf:24: keepalive_timeout 240;
nginx.conf:28: fastcgi_connect_timeout 600;
nginx.conf:29: fastcgi_send_timeout 600;
nginx.conf:30: fastcgi_read_timeout 600;
nginx.conf_bk:30: #keepalive_timeout 0;
nginx.conf_bk:31: keepalive_timeout 65;
nginx.conf_bk:106: # ssl_session_timeout 5m;
nginx.conf.default:30: #keepalive_timeout 0;
nginx.conf.default:31: keepalive_timeout 65;
nginx.conf.default:106: # ssl_session_timeout 5m;
proxy.conf:1:proxy_connect_timeout 600s;
proxy.conf:2:proxy_send_timeout 1200;
proxy.conf:3:proxy_read_timeout 1200;