Windows Firewall blocks unsolicited connections to your computer. This includes blocking the ports required for an FTP client to connect to a remote server. In order to connect to an FTP server, you must configure the Windows Firewall to allow incoming connections through port 21.
To configure Windows Firewall
In the Control Panel, open the Security Center.
Click Windows Firewall. The Windows Firewall dialog box appears.
Click the Exceptions tab, then click Add Port. The Add a Port dialog box appears.
In the Name box, type FTP.
In the Port box, type 21.
Leave TCP selected, then click OK.
Click OK to close the Windows Firewall dialog box.
Click the X in the upper right corner to close the Security Center.
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