96 lines
6.4 KiB
HTML
96 lines
6.4 KiB
HTML
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Prevent Telnet access" />
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<meta name="abstract" content="If you do not plan to use the Telnet server, follow the steps in this topic to disable it. This procedure ensures that it will not be used without your knowledge." />
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<meta name="description" content="If you do not plan to use the Telnet server, follow the steps in this topic to disable it. This procedure ensures that it will not be used without your knowledge." />
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<title>Prevent Telnet access</title>
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</head>
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<body id="rzaiwsecpreventaccess"><a name="rzaiwsecpreventaccess"><!-- --></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 Telnet access</h1>
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<div><p>If you do not plan to use the Telnet server, follow the steps in
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this topic to disable it. This procedure ensures that it will not be used
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without your knowledge.</p>
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<p>If you do not want anyone to use Telnet to access your iSeries™ server,
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you should prevent the Telnet server from running. To prevent Telnet access
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to your iSeries,
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complete these tasks.</p>
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<div class="section" xml:lang="en-us" id="rzaiwsecpreventaccess__preventtelnetfstartauto"><a name="rzaiwsecpreventaccess__preventtelnetfstartauto"><!-- --></a><h4 class="sectiontitle">Prevent Telnet
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from starting automatically</h4><p>To prevent Telnet server jobs from starting
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automatically when you start TCP/IP, follow these steps:</p>
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<ol><li>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>.</li>
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<li>Right-click <span class="uicontrol">Telnet</span> and select <span class="uicontrol">Properties</span>.</li>
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<li>Clear <span class="uicontrol">Start when TCP/IP starts</span>.</li>
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</ol>
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</div>
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<div class="section" xml:lang="en-us" id="rzaiwsecpreventaccess__preventaccesstotelnetports"><a name="rzaiwsecpreventaccess__preventaccesstotelnetports"><!-- --></a><h4 class="sectiontitle">Prevent access
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to Telnet ports</h4><p>To prevent Telnet from starting and to prevent someone
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from associating a user application, such as a socket application, with the
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port that the iSeries normally
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uses for Telnet, follow these steps:</p>
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<ol><li>In iSeries Navigator, click <span class="menucascade"><span class="uicontrol">your
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iSeries Server</span> > <span class="uicontrol">Network</span> > <span class="uicontrol">Servers</span> > <span class="uicontrol">TCP/IP</span></span>.</li>
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<li>Right-click <span class="uicontrol">TCP/IP Configuration</span> and select <span class="uicontrol">Properties</span>.</li>
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<li>In the TCP/IP Configuration Properties window, click the <span class="uicontrol">Port
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Restrictions</span> tab.</li>
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<li>On the Port Restrictions page, click <span class="uicontrol">Add</span>.</li>
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<li>On the Add Port Restriction page, specify the following values:<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>: <samp class="codeph">23</samp> (for non-SSL
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TELNET) or <samp class="codeph">992</samp> (for SSL TELNET)</li>
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<li><span class="uicontrol">Ending port</span>: <samp class="codeph">23</samp> (for non-SSL
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TELNET) or <samp class="codeph">992</samp> (for SSL TELNET)</li>
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<li><span class="uicontrol">Protocol</span>: TCP</li>
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</ul>
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<div class="note"><span class="notetitle">Note:</span> These port numbers are specified in the Work with
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Service Table Entries (WRKSRVTBLE) table under .Telnet-ssl. They might be
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mapped to ports other than 23 and 992. Repeat this process for each port that
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you want to restrict. The Internet Assigned Numbers Authority (IANA) provides
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information about common port number assignments.</div>
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</li>
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<li>Click <span class="uicontrol">OK</span> to add the restriction.</li>
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<li>On the Port Restrictions page, click <span class="uicontrol">Add</span> and repeat
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the procedure for the User Datagram Protocol (UDP) protocol.</li>
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<li>Click <span class="uicontrol">OK</span> to save your port restrictions and to
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close the TCP/IP Configuration Properties window.</li>
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<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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</ol>
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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="rzaiwusracc.htm" title="This topic provides procedures for securing Telnet on your server.">Telnet security</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="http://www.iana.org/" target="_blank">Internet Assigned Numbers Authority (IANA)</a></div>
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</div>
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</div>
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</body>
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