Note for Duplicate Connections in OpenVPN tunnel settings is obscure
In the OpenVPN tunnel settings, vpn_openvpn_server.php, the Duplicate Connections setting could be more explicit. It currently ends with "the same Common Name", but that is hard to parse and not entirely accurate.
It might be worth mentioning the behavior or something to the effect of "If the same person connects from two devices, the older connection will be kicked off". I think just as long the messaging it clearer that is ok.