Windows 7 does a pretty decent job of sealing itself off from the wild and the wooly of the Interweb with its built-in firewall, but sometimes you have an application running that needs to interact with the outside world: a game or an FTP server, perhaps. In order for these applications to work correctly, you’re going to need to punch a hole in your firewall by adding an exception to Windows Firewall.
First, open Windows Firewall settings from the System and Security settings in the Control Panel.
In the left sidebar, click “Allow a program of feature through Windows Firewall”
Choose the program from the list and check the box to the left to allow an exception. Check the boxes to the right to specify which networks the exception is allowed on.
If your application does not appear on the list, click the “Allow another program…” button in the lower left, and either highlight the program from the list or browse for the executable file, then click the “Add” button. (NOTE: for FileZilla Server, make sure that “FileZilla server.exe” is given the exception NOT “FileZilla server interface.exe”)