The 425 error means that the data channel is blocked or closed between you and the server you are trying to connect to. For Active (PORT) connections open port 21. Also open inbound high ports above 1024 to the client.
The FTP server returns this error: “425 Can’t open data connection.” when trying to list a directory or transfer data. This can be caused when a firewall is not allowing connections to be completed. Since FTP uses two connections (the main connection, and then another for the data transfers), this is a problem with firewalls.
The server’s FTP server returns an error: “425 Failed to open a data connection.” Every time you try to upload data to lists or submission sites. This can be disabled if the firewall should not allow connections. Because FTP uses two connections (the main network connection and then another to transfer documents), this is a firewall issue.
The FTP server shows the purpose of the error: 425 Unable to open data connection. – TechRepublic FTP reports error message type to server: 425 Cannot open data regarding. To the one who knows.
Why is my FTP server showing an error message 425?
The FTP server usually displays an error message: 425 Unable to open working data relations. – TechRepublic Server ftp shows all error messages: 425 Unable to open search connection. For those who know about it. I have an FTP server (FileZilla) running on Win2003 with any Zyxel 700 router and I have an SDSL connection. NAT in the hub is fine, ports 40 to 25 are open.
What does FTP error 425 failed to establish connection mean?
“FTP error 425 could not establish a real connection” when trying to connect to a File Transfer Protocol server. Tried 2 FTP clients on 3 machines on the same network – to no avail. However, FTP also works with mobile broadband. The IP address is blocked on the FTP server. Other File Transfer Protocol servers (different IP addresses/hosts) work fine. plan properly, configure non-blocked ports.
What is FTP error 425?
The FTP Error 425 error code can sometimes be caused by a corrupted Microsoft Windows procedure file. Corrupted system files usually pose a serious threat to the life of the system. Here are a few events that happened during system file errors. Incomplete installation, incomplete uninstallation, …
When does FTP say 425 can’t open data connection?
FTP error: “425 Unable to open login details.” Server FTP returns this routing error: “425 Unable to open connection to hard drive”. when trying to enumerate a service or transfer data.
What to do if error 425 cannot open data connection?
Error 425. Unable to open login information by triggering FTP messages. Login information (for site list, upload or download) cannot be set. The most common solution is to change the active/passive mode ringer settings.

Ermias is a tech writer with a passion for helping people solve Windows problems. He loves to write and share his knowledge with others in the hope that they can benefit from it. He’s been writing about technology and software since he was in college, and has been an avid Microsoft fan ever since he first used Windows 95.