81 lines
5.4 KiB
HTML
81 lines
5.4 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta name="DC.Title" content="Prevent access to File Transfer Protocol ports" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<meta name="DC.Identifier" content="preventftpports" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Prevent access to File Transfer Protocol ports</title>
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</head>
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<body id="preventftpports"><a name="preventftpports"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Prevent access to File Transfer Protocol ports</h1>
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<div><div class="section">To prevent File Transfer Protocol (FTP) from starting,
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and to prevent someone from associating a user application, such as a socket
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application, with the port that the iSeries™ normally uses for FTP, follow
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these steps:</div>
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<ol><li class="stepexpand"><span>In iSeries Navigator,
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expand <span class="menucascade"><span class="uicontrol">your iSeries Server</span> > <span class="uicontrol">Network</span> > <span class="uicontrol">Servers</span> > <span class="uicontrol">TCP/IP</span></span> .</span></li>
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<li class="stepexpand"><span>Right-click <span class="uicontrol">TCP/IP Configuration</span> and select <span class="uicontrol">Properties</span>.</span></li>
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<li class="stepexpand"><span>In the <span class="uicontrol">TCP/IP Configuration Properties</span> window,
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click the <span class="uicontrol">Port Restrictions</span> tab.</span></li>
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<li class="stepexpand"><span>On the <span class="uicontrol">Port Restrictions</span> page, click <span class="uicontrol">Add</span>.</span></li>
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<li class="stepexpand"><span>On the <span class="uicontrol">Add Port Restriction</span> page, specify
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the following information:</span> <ul><li><span class="uicontrol">User name</span>: Specify a user profile name that is
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protected on your iSeries. (A protected user profile is a user profile
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that does not own programs that adopt authority and does not have a password
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that is known by other users.) By restricting the port to a specific user,
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you automatically exclude all other users.</li>
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<li><span class="uicontrol">Starting port</span>: 20</li>
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<li><span class="uicontrol">Ending port</span>: 21</li>
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<li><span class="uicontrol">Protocol</span>: TCP</li>
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</ul>
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</li>
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<li class="stepexpand"><span>Click <span class="uicontrol">OK</span> to add the restriction.</span></li>
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<li class="stepexpand"><span>On the <span class="uicontrol">Port Restrictions</span> page, click <span class="uicontrol">Add</span> and
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repeat the procedure for the UDP protocol.</span></li>
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<li class="stepexpand"><span>Click <span class="uicontrol">OK</span> to save your port restrictions
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and close the <span class="uicontrol">TCP/IP Configuration Properties</span> window.</span></li>
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<li class="stepexpand"><span>The port restriction takes effect the next time that you start
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TCP/IP. If TCP/IP is active when you set the port restrictions, you should
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end TCP/IP and start it again.</span></li>
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</ol>
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<div class="section"><div class="note"><span class="notetitle">Notes:</span> <ul><li>The port restriction takes effect the next time that you start TCP/IP.
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If TCP/IP is active when you set the port restrictions, you should end TCP/IP
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and start it again.</li>
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<li>The Internet Assigned Numbers Authority (IANA) website provides information
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about assigned port numbers at <a href="http://www.iana.org" target="_blank">http://www.iana.org</a>.</li>
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<li>If ports 20 or 21 are restricted to a user profile other than QTCP, attempting
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to start the FTP server will cause it to immediately end with errors.</li>
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<li>This method works only for completely restricting an application such
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as the FTP server. It does not work for restricting specific users. When a
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user connects to the FTP server, the request uses the QTCP profile initially.
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The system changes to the individual user profile after the connection is
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successful. Every user of the FTP server uses QTCP's authority to the port.</li>
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</ul>
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</div>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzaiqsecpreventaccess.htm" title="You can block the File Transfer Protocol (FTP) port by reading this topic.">Prevent File Transfer Protocol server access</a></div>
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</div>
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</div>
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</body>
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</html>
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