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FTP Client and FTP Server Show Different PASV Reply When Using Windows Firewall  -  KB Article #1666

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In some cases, the Windows Firewall has been seen to change the outbound passive (PASV) mode reply from Serv-U to an FTP client. Serv-U's log displays the proper PASV port specified under Server | Settings | Advanced, but the client's log indicates a different port. NOTE: The port is specified in the last 2 numbers in the PASV reply.

227 Entering Passive Mode (127,0,0,1,195,80)

This can be caused by the default FTP Server rule included in the firewall for port 21, which is designed for the Windows FTP service.

  • Open the Windows Firewall configuration windows (Control Panel | Windows Firewall).
  • Click on the Advanced tab.
  • Select the Network Connection Settings section at the top.
  • Click the Settings button. Highlight the appropriate network interface first if more than one appears in the list.
  • Remove the check mark from FTP Server in the Services list.

The Windows Firewall should no longer modify Serv-U's PASV reply.