Đợt này làm mấy con server cũng đến mệt, nhất là làm policy, firewall,... bấm mỏi cả tay, hoa cả mắt.
Lưu lại cái bài của author:  Bernard Cheah MVP ở đây đã. Cái FTP passive của IIS có khác các FTP server khác một chút, các cổng passive phải từ 5001 trở lên, nếu vô tình ko để ý service của nó sẽ toi. Mà config cái này nó không có giao diện mà phải dùng 1 script của admin mới tạo dc.

SUMMARY

MORE INFORMATION

The IIS-based FTP service supports both active and passive mode connections, depending on the method that is specified by the client. IIS does not support disabling either active or passive connection modes.
 
Unlike HTTP and other protocols used on the Internet, the FTP protocol uses a minimum of two connections during a session: a half-duplex connection for control, and a full-duplex connection for data transfer. By default, TCP port 21 is used on the server for the control connection, but the data connection is determined by the method that the client uses to connect to the server, as detailed below.
 
Active-mode FTP connections are sometimes referred to as "client-managed" because the client sends a port command to the server, over the control connection. The command requests the server to establish a data connection from TCP port 20 on the server to the client, using the TCP port that is specified by the port command.
 
Passive-mode FTP connections are sometimes referred to as "server-managed", because after the client issues a pasv command, the server responds with one of its transient ports used as the server-side port of the data connection. After a data connection command is issued by the client, the server connects to the client using the port immediately above the client-side port of the control connection.
 
In Passive-mode IIS FTP randomly choose to response with port ranging within 1024 - 65535 by default. To further limit these huge port range, system administrator can configure a metabase property key named PassivePortRange, this property key only exist in IIS 6.0, for IIS 5.0 in Windows 2000, system administrator need to install Service Pack 4 and add in PassivePortRange key in system registry.
 
To change the PassivePortRange for IIS, perform the procedure that is described in one of the following sections.
 
 
For Windows 2003 Server
 
a) To Enable Direct Metabase Edit
1. Open the IIS Microsoft Management Console (MMC).
2. Right-click on the Local Computer node.
3. Select Properties.
4. Make sure the Enable Direct Metabase Edit checkbox is checked.

 
b) Configure PassivePortRange via ADSUTIL script
1. Click Start, click Run, type cmd, and then click OK.
2. Type cd Inetpub\AdminScripts and then press ENTER.
3. Type the following command from a command prompt.
    adsutil.vbs set /MSFTPSVC/PassivePortRange "5500-5700"
4. Restart the FTP service.
 
You'll see the following