425 Could not open data connection to port

Knowledgebase

FTP Error: 425 Could Not Open Data Connection to Port

The error "425 Could not open data connection to port" means your FTP client cannot establish the data channel needed to transfer files. This is usually caused by a firewall or network configuration issue on your end, not a server problem.

Fix: Switch to Passive FTP Mode

The most common fix is to enable Passive mode in your FTP client. Active FTP requires the server to connect back to your computer on a random port, which is often blocked by routers and firewalls. Passive mode reverses this so your client initiates both connections.

In FileZilla:

Go to Edit > Settings
Under Connection > FTP, select Passive
Click OK and reconnect

Other Fixes

Use FTPS: Connect using "Explicit FTP over TLS" on port 21. This is more reliable through firewalls than plain FTP.
Use SFTP: Connect on port 7005 using SFTP (SSH File Transfer Protocol) if SSH is enabled on your account. SFTP uses a single connection and avoids all the active/passive mode issues.
Check your local firewall: Make sure your firewall or antivirus is not blocking FTP data connections.