Error : 425 Can't Open Data Connection

When trying to ftp to a server using Internet browser.

Assuming you are using:

• Windows Server 2008
• IIS 6 (By default)

Problems:

When connecting to a FTP server using Internet Browser, FTP passive mode is being used.

Usually it is due to the firewall.

Solution:

Assuming you are using Windows Firewall in Windows Server 2008.

By default setting, all outbound ports are opened.

To define a range of port for FTP passive mode.
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cscript.exe adsutil.vbs set /MSFTPSVC/PassivePortRange "60000-60999"
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Open the range of port in Windows Firewall (without having to key in one by one)
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FOR /L %I IN (60000,1,60999) DO netsh firewall add portopening TCP %I "Passive FTP"%I
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