Gene6 FTP Server的問題
 

我最近安裝Gene6 FTP Server [版本：3.7.0 (build 24)]，
使用者根目錄都已經建好了，
防火牆的21 port也開了 (使用KIS 7.0.1.222)，
可連線登入，但是卻無法列出目錄
出現 "425 cannot open data connection."
請問該怎麼解決?

以下是訊息：
07/10/30 17:32:26, stopped listening on 192.168.16.168:21
07/10/30 17:32:26, stopped listening on 192.168.20.81:21
07/10/30 17:32:26, stopped listening on 127.0.0.1:21
07/10/30 17:32:26, 4, 192.168.16.168, a, disconnected. (00d00:02:13)
07/10/30 17:32:29, listens on 192.168.16.168:21 (Explicit SSL)
07/10/30 17:32:29, listens on 192.168.20.81:21 (Explicit SSL)
07/10/30 17:32:29, listens on 127.0.0.1:21 (Explicit SSL)
07/10/30 17:32:45, 5, 192.168.16.168, , new connection from 192.168.16.168 on 192.168.16.168:21 (Explicit SSL)
07/10/30 17:32:45, 5, 192.168.16.168, , hostname resolved : your-dve5f7g4af
07/10/30 17:32:45, 5, 192.168.16.168, , sending welcome message.
07/10/30 17:32:45, 5, 192.168.16.168, , 220 Gene6 FTP Server v3.7.0 (Build 24) ready...
07/10/30 17:32:46, 5, 192.168.16.168, , USER a
07/10/30 17:32:46, 5, 192.168.16.168, a, 331 Password required for a.
07/10/30 17:32:46, 5, 192.168.16.168, a, PASS ****
07/10/30 17:32:46, 5, 192.168.16.168, a, logged in as "a".
07/10/30 17:32:46, 5, 192.168.16.168, a, 230 User a logged in.
07/10/30 17:32:48, 5, 192.168.16.168, a, PORT 0,0,0,0,7,255
07/10/30 17:32:48, 5, 192.168.16.168, a, 200 Port command successful.
07/10/30 17:32:48, 5, 192.168.16.168, a, NLST
07/10/30 17:32:48, 5, 192.168.16.168, a, 425 Cannot open data connection.
07/10/30 17:37:46, 5, 192.168.16.168, a, 421 Connection closed, timed out.
07/10/30 17:37:46, 5, 192.168.16.168, a, disconnected. (00d00:05:01)