Total Commander - 421 Sorry, cleartext sessions and weak ciphers are not accepted on this server

При получении ошибки:

421 Sorry, cleartext sessions and weak ciphers are not accepted on this server

Вам нужно подключить SSL/TLS в настройках FTP клиента Total Commander:

Which can be activated inside Total Commander with a few mouse clicks under FTP connections => select name of the FTP connection => Edit => Tick the option SSL/TLS.