OpenVPN setup through Foris: Missing "tun_turris" in ifconfig

Dear readers,
I have bought Omnia and as one of first steps I’m trying to setup OpenVPN. DynDNS service I have up and running (proven with ping to running router / disconnected router, OK).
Client log below:
UDP link remote: [AF_INET]
TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
TLS Error: TLS handshake failed
SIGUSR1[soft,tls-error] received, process restarting
Restart pause, 5 second(s)
It seems that UDP doesn’t reach the server, but if I list the interfaces on Omnia using ifconfig, I can’t find the “tun_turris”. Why? I did followed the Foris interface way, nothing in SSH and only DynDNS in Luci.
Thanks in advance for your help!