Renewing certificates is always a bit of a headache for me, because it is an infrequent task, and I always forget the steps. Also, having to buy certs is something I'd like to avoid. Let's Encrypt is a product that automates the certificate renewal process, and is free. If this could be integrated on the SSL VPN (and other Barracuda products, for that matter), it would be a very welcomed addition. I would love to always have a valid cert installed on the appliance without me having to go through the steps each year (yes, I know I can do longer certs, but don't like buying them in case we phase out a service).
You can see more info here: https://letsencrypt.org/