OpenVPN using the wrong OpenSSL command to list digest algorithms
At least in OpenSSL version 1.1.1i-freebsd, used by pfsense 2.5, there is no longer a "list-message-digest-algorithms" parameter. It has been replaced by "list -digest-algorithms".
The old parameter results in an error <Invalid command 'list-message-digest-algorithms'; type "help" for a list> and may even cause an endless loop on startup/migration.
Pull Request in GitHub: https://github.com/pfsense/pfsense/pull/4501#