That's not the ftp client doing that, it's the ProFTPD server configuration that defines user authentication. You need to talk to whoever administers that software.
Here I have the IIS FTP service configured to require user authentication.
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Windows ftp command line tool automatically force anonymous login
ftp -i -d
ftp> open 192.168.95.1
Connected to 192.168.95.1.
220 ProFTPD Server (Gateway) [192.168.95.1]
---> OPTS UTF8 ON
500 OPTS UTF8 not understood
User (192.168.95.1:(none)): ftp
---> USER ftp
331 Anonymous login ok, send your complete email address as your password
Password:
That's not the ftp client doing that, it's the ProFTPD server configuration that defines user authentication. You need to talk to whoever administers that software.
Here I have the IIS FTP service configured to require user authentication.