What do you see in the php-fpm logs? Maybe the php-fpm processes are not enough to handle the requests.

On September 11, 2014 9:42:51 PM GMT+01:00, nfn <nginx-forum@nginx.us> wrote:
>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
>
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