ftp command landing problem

Due to the recent programming would like to learn the needs of the ftp command
open ftp
re-enter the address of the open carriage return
show
follows
220 Serv-U FTP Server v6.2 for WinSock ready …
User (210.39 .**.**:( none)):jsiiy
331 User name okay, need password.
Password:
password did not show the results of online check
Online said here shows that in fact did not really have lost your password or account
then lose the password to enter End result shows that
530 Not logged in.
Login failed.
Internet search users that the password is wrong But
the password and user name can not be wrong
I can cuteftp landing ah can tell who
This is why I have to address how