How to set up OpenVPN DSR500N?

Question

openvpn

I really need help in any form. The question is to configure this feature of the device as a client. Everything seems to be fine, but in the absence of any diagnostic and debugging tools on the device, it's just .... On the server in the log, everything goes without errors, the only warning associated with link-mtu. I don't know how critical this is. But this device in no way shows itself as successfully connected. I could not find an accessible description either in the manual or on the Internet. Please indicate where and what can be read on this topic?