502 errors with nginx and php5-fpm

[nfn]

Hi,

Here is the debug log: http://pastebin.com/raw.php?i=w8Bwj4pS

Can you help me understand why I have these random 502 error?

Thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,253117,253202#msg-253202