The connection is most probably blocked by the Windows firewall. While the Windows firewall is automatically configured with rules for the ports 21, 990 and 1024-65535, when IIS FTP server is installed, the rules are not enabled initially. To enable or change the rules, go to Control Panel > System and Security > Windows Firewall > Advanced Settings > Inbound Rules and locate three "FTP server" rules. If the rules are not enabled, click on Actions > Enable Rule.
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