502 Bad Gateway - Wordpress

[JerW]

I have since changed AGAIN from using the TCP port of 9000 to the unix
socket.

Here is the new error line:
2012/02/22 11:20:32 [error] 2504#0: *26 recv() failed (104: Connection
reset by peer) while reading response header from upstream, client:
m.y.i.p, server: mydomain.com, request: "GET /wp-admin/install.php
HTTP/1.1", upstream: "fastcgi://unix:/tmp/php5-fpm.sock:", host:
"mydomain.com"

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,222873,222875#msg-222875