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<html>
<title>FTP -- File Transfer Protocol</title>
<meta name=description content="Description of how to use FTP within ArcWeb">
<body>
<h1>File Transfer Protocol (FTP)</h1>
ArcWeb contains its own FTP client which is capable of performing most of the
usual FTP activities. It allows you to upload and download files via
anonymous FTP and <a href="#nonanon">non-anonymous FTP</a> too. The two
alternate types differ only in the authentication required to use them. With
anonymous FTP, no secure authentication is require and non-anonymous FTP
requires specific user authentication (although it still isn't that secure
because the password is passed across the network in plain text format
anyway).
<h2>Anonymous FTP</h2>
The format of a URL for anonymous FTP is:
<blockquote><code>ftp://«FTP server host name»/«path to
object»</code></blockquote>
Provided that the host name you give is running an anonymous FTP service,
then you should be able to access any of the files on it by navigating around
the directory structure by clicking on directories to view those directories,
and clicking on files to download them.
<p>You can also <em>upload</em> files to the server. It is usual for
anonymous FTP servers to allow uploads only to the <code>/incoming</code>
or <code>/pub/incoming</code> directories (although restrictions are far
less with non-anonymous FTP). To upload a file, drag it from a Filer window
onto a window displaying an FTP directory listing generated by ArcWeb. For
more details see the page about <a href="ftpupload">FTP uploads</a>.
<a name=nonanon><h2>Non-anonymous FTP</h2></a>
The format of a URL for non-anonymous FTP is:
<blockquote><code>ftp://«User name»@«FTP server
host name»/«path to object»</code></blockquote>
If the supplied user name requires a password to access the FTP
service supplied by the FTP server, then you will be prompted for it. The
password is cached for the duration of the session (permanently if you have
made the authentication database persistent in the Network configuration
window).
<p>
If you really want to, you can specify the password in the URL thus:
<blockquote><code>ftp://«User
name»:«Password»@«FTP server host
name»/«path to object»</code></blockquote>
The problem with putting the password in the URL directly, is that it will
end up in your global history like that in plain view for anybody to see. If
you bookmark a directory listing, it will end up in your bookmark files. If
you allow ArcWeb to prompt you for the password, then it will only store it
in the authentication database which is stored on disc in an encrypted
format which although not secure would require some work to decrypt.
<hr>
<address>Stewart Brodie<br>5th April 1997</address>
</body> </html>