Views:

The message appears because you are using the IWSS FTP proxy port 21, which is only used for FTP clients. The first line is the standard reply of the IWSS FTP proxy service, while the next line is an error message asking for the authentication credentials.

Internet Explorer, for example, uses the following credentials by default:

Anonymous/IEuser@ when using anonymous FTP

To enable FTP over HTTP, set the proxy to the IWSS HTTP service port, which is 8080 by default.