Nginx/0.8.54 502 bad gateway,very strange

hi, guys.
I have a big problem, it torture me two days.
centos 4.7, nginx 0.8.54, php 5.2.14.
There’s a page, it’s has four frames each include a php file.
502 bad gateway occured when I use chrome open it.
But seldom happened when I use IE.
because IE load four php filese sequenced, but chrome paralleled
load the four php files.
I test a single php file with LoadRunner, no 502 happened.

It's confused me.
thanks a lot.

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,213624,213624#msg-213624

I have solved this problem.
just change fastcgi address from unix sock to tcp .
good luck to us.
perhaps it’s a bug on this version.

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,213624,213645#msg-213645