67 lines
4.3 KiB
HTML
67 lines
4.3 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!DOCTYPE html
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<html lang="en-us" xml:lang="en-us">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="security" content="public" />
|
|
<meta name="Robots" content="index,follow" />
|
|
<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
|
|
<meta name="DC.Type" content="task" />
|
|
<meta name="DC.Title" content="Prevent TFTP access" />
|
|
<meta name="abstract" content="This article discusses the steps for preventing users from accessing the TFTP server." />
|
|
<meta name="description" content="This article discusses the steps for preventing users from accessing the TFTP server." />
|
|
<meta name="DC.Relation" scheme="URI" content="rzamvtcptftp.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="tcpstoptftp" />
|
|
<meta name="DC.Language" content="en-us" />
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|
<title>Prevent TFTP access</title>
|
|
</head>
|
|
<body id="tcpstoptftp"><a name="tcpstoptftp"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Prevent TFTP access</h1>
|
|
<div><p>This article discusses the steps for preventing users from accessing
|
|
the TFTP server.</p>
|
|
<div class="section">If you do not have any thin clients attached to your network, you
|
|
probably do not need to run the TFTP server on your system. Do the following
|
|
to prevent the TFTP server from running:</div>
|
|
<ol><li class="stepexpand"><span>To prevent TFTP server jobs from starting automatically when you
|
|
start TCP/IP, type the following: <kbd class="userinput">CHGTFTPA AUTOSTART(*NO)</kbd></span> <p>AUTOSTART(*NO) is the default value.</p>
|
|
</li>
|
|
<li class="stepexpand"><span>To prevent someone from associating a user application, such as
|
|
a socket application, with the port that the system normally uses for TFTP,
|
|
do the following:</span><ol type="a"><li class="substepexpand"><span>Type <kbd class="userinput">GO CFGTCP</kbd> to display the <span class="uicontrol">Configure
|
|
TCP/IP</span> menu.</span></li>
|
|
<li class="substepexpand"><span>Select option <span class="uicontrol">4</span> (Work with TCP/IP port
|
|
restrictions).</span></li>
|
|
<li class="substepexpand"><span>On the Work with TCP/IP Port Restrictions display, specify option <span class="uicontrol">1</span> (Add).</span></li>
|
|
<li class="substepexpand"><span>For the lower port range, specify <kbd class="userinput">69</kbd>.</span></li>
|
|
<li class="substepexpand"><span>For the upper port range, specify <kbd class="userinput">*ONLY</kbd>.</span> <div class="note"><span class="notetitle">Note:</span> The port restriction takes effect the next time that you start
|
|
TCP/IP. If TCP/IP is active when you set the port restrictions, you should
|
|
end TCP/IP and start it again.</div>
|
|
</li>
|
|
<li class="substepexpand"><span>For the protocol, specify <kbd class="userinput">*UDP</kbd>.</span></li>
|
|
<li class="substepexpand"><span>For the user profile field, specify a user profile name that
|
|
is protected on your system. (A protected user profile is a user profile that
|
|
does not own programs that adopt authority and does not have a password that
|
|
is known by other users.) By restricting the port to a specific user, you
|
|
automatically exclude all other users.</span></li>
|
|
</ol>
|
|
</li>
|
|
</ol>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzamvtcptftp.htm" title="These articles discuss methods for securing the TFTP server for authorized users and preventing access to the TFTP server.">Security considerations for using TFTP server</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |