I have found out that the crash log is literally full of the following errors, happening all day and night: (the log has risend to 3.3 MB for a week…)

Thu Jan 13 08:48:45 2022 daemon.err openvpn[6418]: 192.241.206.175:36048 TLS Error: reading acknowledgement record from packet
Thu Jan 13 08:49:45 2022 daemon.err openvpn[6418]: 192.241.206.175:36048 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network connectivity)
Thu Jan 13 08:49:45 2022 daemon.err openvpn[6418]: 192.241.206.175:36048 TLS Error: TLS handshake failed

the IP addresses are random. Please note that the OpenVPN server is enabled and works, but it is not used at all, it is just active! So, it is very strange, or I don’t understand what these random IP adresses and TLS handshare fails are, happening 24x7 when the server is not connected to at all?!