-tlsServerPreference

The option -tlsServerPerference specifies, whether the cipher suite preference order of the FTP client or the FTP server is applied.

-tlsServerPreference

NO | YES

NO

The cipher suite preference order of the FTP client determines the selection of the cipher suite to be used.
NO is the default.

YES

The cipher suite preference order of the FTP server (and not of the FTP client) determines the selection of the cipher suite to be used.
This can be used to prefer on the server's side ChaCha20 based cipher suites over AES based ones, because ChaCha20 shows on systems without AES hardware support usually better performance than AES.