425 Can't open data connection error. > 기술자료

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Problem
425 Can't open data connection error
While using SmartFTP with a firewall the user keeps on getting a 425 Can't open data connection error.

Cause
The 425 error means that the data channel is blocked or closed between you and the server you are trying to connect to.

Solution
For Active connections open ports 20 and 21
For Passive connections open ports 21 and 1024+ (and higher)

If a successful connection cannot be established, check all devices that are between the client and server to ensure that the proper ports are open (e.g. routers).

참고자료
http://www.smartftp.com/support/kb/425-cant-open-data-connection-f59.html 
http://woojongwon.tistory.com/27