iis6 FTP 서버 passive모드 포트 열기(windows 2003 server)

1. Open the Control Panel and activate the Windows Firewall control.
2. Click on the Advanced tab, select the network interface that the FTP is bound to and make sure that this option is checked to enable the firewall for this interface. 
3. Click on the "Settings..." button.
4. Click on the Services tab and CLEAR the check box for the "FTP Server" option. I know this makes no sense, but neither does the conflict between server and firewall!
5. Click on the "OK" button to close the Advanced Settings dialog.
6. Click on the Exceptions tab, then click on the "Add Program" button.
7. Browse to "C:\WINDOWS\SYSTEM32\INETSRV\inetinfo.exe" and double click on this file to select it.
8. You may want to use the "Change Scope..." button to narrow the range of IP addresses that can contact the FTP server.
9. Click on the "OK" button to close the Add a Program dialog.
10. Click on the "OK" button to close the Windows Firewall control.
11. You may need to reboot for the changes to take effect since "inetinfo.exe" runs as a service. I just restarted IIS.

https://social.technet.microsoft.com/Forums/windowsserver/en-US/706e5104-325c-4c43-8c06-a20704569bf4/ftp-server-failed-to-retrieve-directory-listing?forum=winservergen