A few years ago I set up an FTP server for a client, and tested with multiple FTP client software it works as expected with explicit TLS and passive transfers. Cyberduck has alway been my favourite file transfer client and it worked just fine.
Server side is setup with vsftpd and with default settings for ssl_request_cert=YES and require_cert=NO. The latter means (according to man page):
If set to yes, all SSL client connections are required to present a client certificate.
Cyberduck now asks me to point to a local certificate in my login keychain and wants to export it. Without completing this I'm no longer able to connect to the FTP server with Cyberduck. When I test this for my client with alternative tools like FileZilla and WinSCP I can still connect fine without configuring a client TLS cert.
This appears to be a bug, i think the use of a client cert should not be mandatory on the client unless the server requires it.
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