Error "... missing parameter(s) in config.conf:20: remote-cert-tls (2.0.9)"This error happens if your version of OpenVPN is less than 2.1.*
We head for using the latest stable versions of software, that's why client configurations are make for the latest version of OpenVPN => 2.1.*
remote-cert-tls serverin version 2.1.* is the same as
ns-cert-type serverin version 2.0.*, but with some extentions.
They have one purpose - to resist the "Man in the middle" attack.
You can solve this problem in two ways:
1. Update OpenVPN GUI
2. Change the parameter to
ns-cert-type server3. Comment or remove this configuration parameter.