怎样对登陆ftp server 的软件如cuteftp设置才可以正常传送文件。
有是会遇到问题如：

socket error

此外，
passive andn

port connection 有何不同。什么时候应选择passive mode

什么时候选port type

谢谢

COMMAND:> TYPE A
200 Type set to A.
COMMAND:> REST 0
350 Restarting at 0. Send STORE or RETRIEVE.
COMMAND:> PORT 172,20,106,20,5,70
530 Only client IP address allowed for PORT command.
ERROR:> Not logged in.
ERROR:> Failed to establish data socket.

using cuteftp, can you tell me is it the problem of my software. or the problem of the server side