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