I install OpenVPN on my server following this guide --> https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-14-04
I also setup a firewall with ufw where I add rule to allow ssh connection only from my interal IP assign to me after the VPN is Active.
I cannot connect to my server with this configuration, with or without VPN. What can I do to configure the network to allow ssh connection ONLY over VPN tunnel?