Error Message Using FTP or Gopher Services with Proxy Server

When you attempt to use Internet Explorer to open a File Transfer Protocol (FTP) or Gopher Universal Resource Locator (URL), you may receive one of the following error messages:

This behavior can occur if you use a proxy server to access the Internet and the proxy server requires authentication. The versions of Internet Explorer listed above do not support accessing FTP or Gopher sites using a proxy server that requires authentication.

To resolve this problem, upgrade to or install Internet Explorer 4.01 Service Pack 1.

Internet Explorer 4.01 Service Pack 1 supports FTP and Gopher services through a proxy server that authenticates users using any type of authentication (for example, Basic or Windows NT Challenge Response). If the proxy server requires authentication, you are prompted for your user name and password (even if the proxy server is using Windows NT Challenge Response).

A proxy server is a server on a local area network that lets you connect to the Internet without using a modem.