68 lines
4.8 KiB
HTML
68 lines
4.8 KiB
HTML
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<meta name="DC.Title" content="Prevent access to Post Office Protocol ports" />
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<meta name="abstract" content="To secure your Post Office Protocol (POP) server from unknown applications, you might want to prevent access to POP ports." />
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<title>Prevent access to Post Office Protocol ports</title>
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<body id="preventaccesstopopports"><a name="preventaccesstopopports"><!-- --></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 Post Office Protocol ports</h1>
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<div><p>To secure your Post Office Protocol (POP) server from unknown applications,
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you might want to prevent access to POP ports.</p>
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<div class="section">To prevent POP from starting and to prevent someone from associating
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a user application, such as a socket application, with the port that the iSeries™ server
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normally uses for POP, complete the following 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 TCP/IP Configuration Properties window, click the <span class="uicontrol">Port
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Restrictions</span> tab.</span></li>
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<li class="stepexpand"><span>On the Port Restrictions page, click <span class="uicontrol">Add</span>.</span></li>
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<li class="stepexpand"><span>On the Add Port Restriction page, specify the following settings:</span> <ul><li><span class="uicontrol">User name</span>: Specify a user profile name that is
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protected on your iSeries server. (A protected user profile is a user
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profile that does not own programs that adopt authority and does not have
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a password that is known by other users.) By restricting the port to a specific
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user, you automatically exclude all other users.</li>
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<li><span class="uicontrol">Starting port</span>: <kbd class="userinput">109</kbd></li>
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<li><span class="uicontrol">Ending port</span>: <kbd class="userinput">110</kbd></li>
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<li><span class="uicontrol">Protocol</span>: <kbd class="userinput">TCP</kbd></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 Port Restrictions page, click <span class="uicontrol">Add</span> and
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repeat the procedure for UDP.</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 TCP/IP Configuration Properties window.</span></li>
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</ol>
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<div class="section">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.</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="preventpopaccess.htm" title="If you do not want anyone to use Post Office Protocol (POP) to access your iSeries server, you should prevent the POP server from running.">Prevent Post Office Protocol access</a></div>
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