This issue may occur if the following conditions exist:
* You try to access the FTP site from behind a Web proxy firewall such as the Internet Security and Acceleration (ISA) Server firewall.
* Folder view for FTP sites is enabled in the Internet Explorer versions that are listed in the "Applies to" section.
When you turn on folder view for FTP sites, the Internet Explorer client bypasses the Web Proxy and tries to send FTP connection requests directly to the Internet. This operation is unsuccessful.