Your configuration doesn't seem to have any problems. tsl key negotiation fails probably due to the following reasons: 1. If there is still a gateway on the front end of the ER8411, it could be due...

On the er605.

1. It is recommended to post a screenshot of the OpenVPN configuration and LAN status. 2. Maybe you can try to use other software to connect to OpenVPN, there are many such software on the internet.

The IP Pool you mentioned refers to the virtual IP address to be assigned to the device connected to the VPN, you can try to set it to 172.168.10.1/24, save it and then export the VPN file again,...

The manual for this switch is linked below: https://static.tp-link.com/upload/manual/2023/202305/20230531/1910013259_Easy%20Smart%20Switch_UG.pdf I hope this helps. If the problem persists, you can...

As stated in the link mentioned by Tedd404 guy, you need to do the relevant configurations on the router and switch separately, and finally you need to set the gateway to the IP of the VLAN interface...