The OpenVPN Status page on the pfSense shows the following error:
[error] Management Daemon Unreachable
Disabling then enabling the configured VPN does not resolve this. How do you restart the daemon?
In my case, the openvpn daemon was dying on a bad CRL file. I've consoled into the pfsense, commented the #daemon option in the conf file and started the service manually to identify the error:
For restarts, you can always kill this process and start it from the console.