Try searching the internet for help on your router or the vendor's site for the instruction manual.I really don't have the resources to verify whether this is correct, so maybe you could help me out a bit.
That could be your issue. Would be best if you could only have one router connected while diagnosing this problem. There may be a firewall or something related with multiple routers that is preventing the OpenVPN connection.my home network consists of 3 routers (one master and two slaves; the slaves connected LAN-LAN to the master with DHCP turned off). And yes, I have one subnet set up on the master router.
Have you tried searching the internet for a similar setup and potential solution? This is not a standard network setup, so our support is limited.