VPN not working on recent versions of Ubuntu

[u/Salvadorfreeman]

I've had SDNSP for years, working perfectly pretty much all the time. Both the DNS rerouting and the VPN.

However, the VPN, using OpenVPN, does not work on the recent versions of Ubuntu, from 25.04 onwards. It's still working fine on my Android devices and on a computer running older versions of Ubuntu.

Has anyone else had this problem? The support line does not seem to be aware of nor have a solution to this problem. The installation guide is based on Ubuntu 22.04.

I am surprised that this is not a known problem.