Nginx php5fmp listen backlog

Hi, i’configured nginx server seeking this article: The socket are TCP mode, but i’ have some timeout errors similar to recv() failed (104: Connection reset by peer) while reading response header from upstream . I configured listen.backlog = 65536 on phpfpm.conf and the same value at the sysctl.conf, but if i get server/status for view php-fpm status module, the value for listen queue len always is 0!

Anyone can help me? Many thanks.