OpenVPN Support Forum

Hello,
I have installed and connected OpenVPN server to client successfully. But I can not access to OpenVPN Admin Web Interface. When I open https:// server_ip_addresss/admin, I get 404 Not Found error.

Sounds like you probably have a web service running on it already, and you're getting that service's 404 page. You may want to move Apache2 or Nginx or whatever you use for web services aside so Access Server can run, or configure Access Server on different ports using ovpn-init.