嗨，请教每次用Update Now上传网页时总出现 "531 Sorry,you can only login 1 times",什么原因????

[chuhu]

大家好，我在做一个网页，可是用Update Now上传时总出现如下信息：

正在连接 ftp.go.163.com . . .
正在连接 ftp.go.163.com (202.108.42.39). . .
Socket已经连接. 正在等待欢迎信息 ...
COMMAND:>QUIT
*** Socket is closed by remote server or offline ***
*** Socket is closed by remote server or offline ***
Attempt 1
正在连接 ftp.go.163.com . . .
正在连接 ftp.go.163.com (202.108.42.39). . .
Socket已经连接. 正在等待欢迎信息 ...
COMMAND:>QUIT
*** Socket is closed by remote server or offline ***
*** Socket is closed by remote server or offline ***
Attempt 2
正在连接 ftp.go.163.com . . .
正在连接 ftp.go.163.com (202.108.42.39). . .
COMMAND:>QUIT
...
请问什么原因呀???