Tons of wp-cron error

My vps use nginx (tuxlite script). When I check the error.log I got this:

2014/01/02 07:17:29 [error] 589#0: *54856 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 108.162.237.59, server: www.domain.com, request: "POST /wp-cron.php?doing_wp_cron=1388665049.7989039421081542968750 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm-domain.sock:", host: "www.domain.com"
2014/01/02 07:18:36 [error] 589#0: *54917 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 108.162.237.59, server: www.domain.com, request: "POST /wp-cron.php?doing_wp_cron=1388665116.2248499393463134765625 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm-domain.sock:", host: "www.domain.com"
2014/01/02 07:19:43 [error] 589#0: *54980 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 108.162.237.59, server: www.domain.com, request: "POST /wp-cron.php?doing_wp_cron=1388665183.4369020462036132812500 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm-domain.sock:", host: "www.domain.com"
2014/01/02 07:20:46 [error] 589#0: *55019 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 108.162.237.59, server: www.domain.com, request: "POST /wp-cron.php?doing_wp_cron=1388665246.2473208904266357421875 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm-domain.sock:", host: "www.domain.com"

How to fix this?

http://wordpress.org/plugins/cloudflare/