HolzlPaolo
A virtual machine is running the OpenVpn server under Virtualbox (Ubuntu 22.04) and it works fine.
The network interface is enp03s.
The machine was moved to a new virtual machine, ProxMox, changed the interface name from enp03s to ens18.
Restarting the machine the network no longer works.
I corrected the interface name in /etc/network/interfaces from enp03s to ens18.
After reboot the network is started, ping internal addresses and get pinged.
If I try to connect from Client the authentication works perfectly and the graph shows the transferred data.
With the VPN on from the client it is not possible to ping other PCs from the internal network but also from the external network.
Does the network interface name under Linux require changing in other places?
