Adding socket activation to stunnel
Tech Pantheon Stunnel Systemd

“Stunnel is a proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the programs’ code.”

At Pantheon we use stunnel internally as part of our Enterprise Gateway feature which tunnels outbound traffic from the platform via a static IP address.

I was happy to be able to contribute a patch to the stunnel project enabling socket activation, for integration with systemd.

Screenshot of stunnel changelog