Hello,
I'm glad to help!
I will ask you to generate a troubleshoot file to better understand your configuration and the issue you are facing. Replicate the issue (try connecting to the OpenVPN server), then navigate to System → Administration → Troubleshoot, and generate the file. This file can be attached to the original question and will only be visible to Teltonika moderators.
I will also ask you to explain your configuration, if Windows clients will be connecting to the OpenVPN server, perhaps you could also share the .ovpn file that is used on Windows?
From your screenshots, I can also see that there are quite a few firewall zones created, could you explain why they are needed? OpenVPN creates a firewall zone and the rules automatically, so nothing needs to be changed in the firewall to connect to the server.
Awaiting your response!
Best regards,
DaumantasG