OpenVPN Support Forum

Reading around suggests that preshared key connection should be enabled in version 1.0.1. However, along with other users, creating a unified .ovpn file using the directive setenv CLIENT_CERT 0 and then embedding the static key with either <secret> or <tls-auth> tags still results in the PolarSSL error 'ca certificate is undefined'.
Is static key enabled in 1.0.1?

The manual of OpenVPN Connect says:

Static key encryption mode (non-TLS) is not supported

You can connect without a client certificate if the server doesn't ask for one by setting setenv CLIENT_CERT 0. But to my knowledge the server itself must present a certificate to the client.