Since version 0.8.x I've noticed that my keep-alive sessions are not removed properly (see http://xgame.pl/nginx/ ). I'm guessing that it's connected to keepalive_requests function, since it was introduced in 0.8.x. FYI: Server config: keepalive_timeout 10 keepalive_requests 250 nginx 0.8.4 Posted at Nginx Forum: http://forum.nginx.org/read.php?2,3374,3374#msg-3374