Nginx + php-fpm "504 Gateway Time-out" error with almost zero load (on a test-server)

[minaev]

> you have too many connections and FPM is not able
> to handle
> everything. You can play with backlog, max_client
> and timeouts.

Thank you. I have already set listen.backlog to 4096. While tweaking the
timeouts, I got the situation I described above. And, sorry, max_client
stands for what?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,127854,128340#msg-128340