Trouble using a certificate to connect to an OpenVPN server.

Hello everyone

I'm having problems adding a certificate to connect to my newly made OpenVPN server that's hosted on my raspberry pi. I followed a tutorial at http://raspberrypi-hacks.com/29/turn-your-raspberry-into-an-openvpn-vpn-server/ and it seems to work on the server-side. I got a folder containing a certificate in .csr and .crt format. I can import them to Keychain Access without problems, but I cannot find it when I have to choose a cert for the setup of the built-in VPN client. I can choose between a bunch of other not related certificates, but not the one I just added. I have tried adding them to different keychains (login, system etc), editing in the "trusted" preferences and exporting them as a .cer certificate, but without any result.

Google is not much of a help, since most of the post are 3-5 years old and concerning Cisco certs. And I know I can just use another VPN client, but I'd like to use the built-in. I'm running OS X 10.8.4 and the latest version of openvpn and openssl.

Thanks in advance,

Philip