wu-ftp 无法dir ,特急

flower00

os：solaris 8
wu-ftpd-2.6.2
执行ls时，或用客户软件登陆时看不到目录。除非执行 ls -l。

$ ftp localhost
Connected to localhost.
220 yanshi FTP server (Version wu-2.6.2(1) Wed Aug 6 08:40:01 EDT 2003) ready.
Name (localhost:jxie): channel
331 Password required for channel.
Password:
230 User channel logged in.
ftp> pwd
257 "/" is current directory.
ftp> ls
200 PORT command successful.
550 No files found.
ftp> ls -l
200 PORT command successful.
150 Opening ASCII mode data connection for /bin/ls.
总数 8
drwxr-xr-x   2 root     other        512  4月  7 17:25 bin
drwxr-xr-x   2 root     other        512  4月  7 17:27 dev
drwxr-xr-x   2 root     other        512  4月  7 17:25 etc
drwxr-xr-x   4 root     other       1024  4月  7 17:32 usr
226 Transfer complete.
remote: -l
248 bytes received in 0.058 seconds (4.18 Kbytes/s)

请大侠帮忙看看如何解决。谢过！