After last update (to version 2.5.0) openvpn generates a warning message
OpenVPN now uses a netlink interface for network configuration. The systemd
units start the process with a dedicated unprivileged user 'openvpn', with
extra capabilities(7). The configuration should no longer drop privileges,
so remove 'user' and 'group' directives.
Scripts that require elevated privileges may need a workaround
After last update (to version 2.5.0) openvpn generates a warning message
Indagate on the eventual needed modifications.