Connection on Openvpn instance keeps disconnecting the clients

[jasgg]

Hello all,

I'm setting up several OPNsenses boxes for several clients to replace existing ones from other vendors.

So, I have a box for testing and I've set OpenVPN using the new instances method, but this is causing all the VPN clients to keep restarting, my best guess is because of a lack of connectivity on the VPN tunnel, as only the traffic for the remote LAN is passed.
I couldn't find any settings for allow/disallow this on the configuration GUI and 'Google' points in so many directions that I decided to question here.

I have configured a 'legacy' server on the side of the instances, and that one does not disconnect the clients.

Where shall I start digging?
What shall I change on the .conf's files, if the case? since this probably gets overwritten on the updates/upgrades?

The idea is to have a POC box with the latest possible technologies for firewalling.

Thanks in advance.

JG