phpMyAdmin与nginx和php-fpm - 错误502

Question

在nginx + php-fpm中出现错误502，错误的网关。仅在phpMyAdmin中发生此错误。 error.log中有错误：

2012/05/14 10:12:28 [error] 1888#0: *209 recv() failed (104: Connection reset by peer) while reading response header from upstream

这是php位置的nginx配置：

fastcgi_pass   127.0.0.1:9000;
fastcgi_index  index.php;
fastcgi_param  SCRIPT_FILENAME  $document_root/$fastcgi_script_name;
fastcgi_buffers 256 128k;
fastcgi_buffer_size 512k;
fastcgi_connect_timeout 300s;
fastcgi_send_timeout 300s;
fastcgi_read_timeout 300s;
include fastcgi_params;

使用此程序：PHP 5.4.2（FPM），nginx / 1.1.19。会话现在存储在memcache中。在过去它存储在文件中，错误502也是。