能连接上服务器，可是子目录经常打不开，显示如下：
WinSock 2.0
正在连接到 21chong
已连接到 21chong -> IP=211.155.234.185 PORT=21
220 Serv-U FTP Server v5.0 for WinSock ready...
USER 21chong123
331-赛友在线
mail:support@zj01.com
www.zj01.com
331 User name okay, need password.
PASS (hidden)
230 User logged in, proceed.
SYST
215 UNIX Type: L8
CWD /
250 Directory changed to /
PWD
257 "/" is current directory.
TYPE A
200 Type set to A.
PASV
227 Entering Passive Mode (211,155,234,185,10,63)
LIST
426-Maximum disk quota limited to 100000 kBytes
Used disk quota 52666 kBytes, available 47333 kBytes
426 Transfer aborted.
List Error

这是什么意思啊？

图片如下：


用IE直接连接的提示：（