Here is the error :
2013/11/13 13:37:11 [error] 806#0: *34 upstream timed out (110: Connection timed out) while reading upstream, client: 117.252.15.40, server: electrosome.com, request: "GET /wp-admin/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "www.electrosome.com"
2013/11/13 13:38:12 [error] 806#0: *157 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 117.252.15.40, server: electrosome.com, request: "GET /?bbp_5o1_toolbar_css&ver=3.7.1 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "www.electrosome.com", referrer: "http://www.electrosome.com/wp-admin/"
2013/11/13 13:39:18 [error] 806#0: *219 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 117.252.15.40, server: electrosome.com, request: "GET /wp-admin/admin.php?page=w3tc_dashboard&w3tc_flush_all&_wpnonce=c0073bc934 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock", host: "www.electrosome.com", referrer: "http://www.electrosome.com/wp-admin/"

I am a beginner in ngix and linux vps.. please help me.