This option is only needed if you plan to use the Windows Firewall and the server must communicate with a remote FTP server ...

This option is only needed if you plan to use the Windows Firewall and the server must communicate with a remote FTP server using normal (or active) mode FTP. Selecting this option will allow the FTP client to accept a solicited inbound connection from the remote FTP server which is required when normal mode FTP is used.
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