求助FTP连接VPS，出现421错误，求大神帮忙

ftp> open
(to) 138.197.25.220
Connected to 138.197.25.220.
220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
220-You are user number 1 of 50 allowed.
220-Local time is now 14:14. Server port: 21.
220-This is a private system - No anonymous login
220-IPv6 connections are also welcome on this server.
220 You will be disconnected after 15 minutes of inactivity.
Name (138.197.25.220:eden): Eden
331 User Eden OK. Password required
Password:
421 Service not available, remote server has closed connection.
ftp: Login failed
ftp>