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I have several Windows 7 computers on the same network using the same router. On one of them I installed FileZilla server.

Using Chrome, Internet Explorer, etc. I am able to connect and upload to the server from all client computers.

I also have a .NET program that uploads files using FtpWebRequest class. When I try to upload using my program it works from some computers but not from others. I get the following error from the server:

425 Can’t open data connection for transfer of

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This is probably a problem of firewalls blocking data connections into the computer. You need to switch to passive mode, see Is it possible to use “Passive Mode” with FtpWebRequest.

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