Double check your FTP server configuration and the firewall dealing with PASV mode. You should configure the FTP server a smaller scope of ports.
The error as pesos pointed out is with the configuration, but not with credentials but your client configuration requiring secure (TLS) connection.
If you decide you want FTP over TLS, make sure to setup the certificate/TLS portion of proftpd.
You posted one but in the error you have a completely different set of credentials.
Once you remove the above, Peos pointed out that you should check your credentials.