instead of aws default ami linux, now i use utuntu server since more discussion on the web!!
ref
 http://aws-labs.com/set-openvpn-server-ubuntu-14-04/

lauch linux server as vpn server, 1st make ddns work
 http://n4jj.x.rootbsd.net:8080/~cpfong/docs/cp_class/ami_linux_ddns.txt

aws ami linux new user cannot login
http://stackoverflow.com/questions/5918343/how-to-login-to-ec2-machine
  vi /etc/ssh/sshd_config - PasswordAuthentication yes
  sudo restart
  useradd cpfong
  passwd cpfong

note:
check n4jj:~user/ddns/00ReadME.txt and modify at most 2 files (4 files are needed: build.sh rc.conf secret secret.pri)

public vpnGate by Japan
http://www.vpngate.net/en/

using linux ami, and install openvpn manually
https://www.comparitech.com/blog/vpn-privacy/how-to-make-your-own-free-vpn-using-amazon-web-services/

market place openvpn server work ok
ref http://envyandroid.com/setup-free-private-vpn-on-amazon-ec2/
steps:
 1. aws marketplace search 4 openvpn - FreeTier - t2.micro - 
     user.data 
     --
     public_hostname=vpn.cp.ifong.org
     admin_user=vpn  
     admin_pw=my2330fotech@#$)
     reroute_gw=1  
     reroute_dns=1  
 2. ssh -i ~/ca/aws-20161201.pem openvpnas@54.199.243.194 (openvpnas@openvpnas2:~$)
openvpnas@openvpnas2:/usr/local/openvpn_as/etc$ pwd
/usr/local/openvpn_as/etc
/etc/init.d/openvpnas restart

openvpnas@openvpnas2:/etc/init.d$ sudo find / -name openvpnas
/etc/pam.d/openvpnas
/usr/local/openvpn_as/scripts/openvpnas
/home/openvpnas

 3. goto windows openvpn client, you may login use vpn:my2330... and get aws IP