#Centos 7
wget http://swupdate.openvpn.org/as/openvpn-as-2.1.9-CentOS7.x86_64.rpm
rpm -i openvpn-as-2.1.9-CentOS7.x86_64.rpm
passwd openvpn

Connect Client:
URL https://ipaddress:943

Connect Admin:
URL https://ipaddress:943/admin

service openvpn restart