ZitaFTP Server released in the Version 1.33 for AmigaOS 4 and Windows.

Users can now get and renew their SSL certificates automatically via Let's Encrypt and ZeroSSL (affiliate link). Both will let you create free certificates for your server, provided that it's visible over the internet (on the standard HTTP port 80).

You'll also need a domain name, and probably a Dynamic DNS (DDNS) service. Dynu is the one I used for testing, and you can get a subdomain from them for free.

Changes:

Server settings UI wouldn't allow the maximum number of clients to be set to 0 (infinite). FIXED
Server settings UI wasn't showing error messages immediately. FIXED
Fixed a rare "SSL routines:ssl3_write_pending:bad write retry" error that could cause HTTP requests to be cut off
Now recognizes HTTP proxy headers, so it won't treat proxy connections as local
Local peer detection wasn't working properly for HTTPS connections. FIXED
Fixed a possible SEGV fault if a receive error occurred before the start of an HTTP message (e.g., a client tries to establish an HTTPS connection on an HTTP port)
Fixed a silly bug that flipped the HTTP port number's endianness

https://keasigmadelta.com/blog/zitaftp- ... rtificates