Any update on this? Seeing this problem with nginx leaving connections open on AWS Beanstalk using nginx to proxy to puma/ruby on rails.
nginx version: nginx/1.6.2
NAME="Amazon Linux AMI"
VERSION="2015.03"
ID="amzn"
ID_LIKE="rhel fedora"
VERSION_ID="2015.03"
PRETTY_NAME="Amazon Linux AMI 2015.03"
ANSI_COLOR="0;33"
CPE_NAME="cpe:/o:amazon:linux:2015.03:ga"
HOME_URL="http://aws.amazon.com/amazon-linux-ami/"
Amazon Linux AMI release 2015.03
Linux ip-172-31-12-138 3.14.42-31.38.amzn1.x86_64 #1 SMP Wed May 13 20:33:05 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux