“421 Sorry, cleartext sessions are not accepted on this server” means that the server is using “FTP Over Explicit TLS/SSL”. This is a Good Thing.
You might be able to fix it by giving the protocol “ftpes:” instead of “ftp:”:
-
ftpes://ftp.somesite.com/some_folder… or …
-
ftps://ftp.somesite.com/some_folder
You’ll probably need to use another FTP client besides your default browser.
I don’t know if newer versions of IE support FTP over SSL.
Filezilla might be a good choice:
- https://filezilla-project.org/