Technology Group of the North, LLC

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Filezilla Client - IIS FTP - 425 Can't open data connection.

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Posted by Allan Lee Mesina

Problem: You are having difficulty connecting to your FTP server hosted in Windows with the following error message;

Command:    PWD
Response:    257 "/" is current directory.
Command:    TYPE I
Response:    200 Type set to I.
Command:    PASV
Response:    227 Entering Passive Mode (xxx,xxx,xxx,xxx,x,xx).
Command:    LIST
Response:    425 Can't open data connection.
Error:    Failed to retrieve directory listing

Cause:
Windows Firewall is blocking the required media ports.
Solution:  Configure FTP service on the network adapter.
1. Start - Control Panel - Windows Firewall
2. Click on the Advanced Tab
3. Click to select your Network Adapter (Local Area Connection) - then click Settings
4. Put a check mark on FTP Server.
5. Click OK