Troubleshooting Reaching Systems Over The VPN Tunnel
https://openvpn.net/vpn-server-resources/troubleshooting-reaching-systems-over-the-vpn-tunnel/
If at the very first step it didn't even try to contact the VPN server's internal VPN subnet, then probably there is a missing route, or you are using open source client without administrative privileges, or there is a subnet conflict, or permissions are set up wrong somehow on the server. Using TCPdump and ping to test the path. Go to the OpenVPN Access Server's console or start an SSH session to that server …
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