NFSv4 over stunnel, by yours truly.

https://www.linuxjournal.com/content/encrypting-nfsv4-stunne...

RFC-9289: Towards Remote Procedure Call Encryption

“Special mention goes to Charles Fisher, author of ‘Encrypting NFSv4 with Stunnel TLS’ [LJNL]. His article inspired the mechanism described in this document.”

https://www.rfc-editor.org/info/rfc9289