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<h1 class="topictitle1">Change Domain Name System debug settings</h1>
<div><p>The Domain Name System (DNS) debug function can provide information
that can help you determine and correct DNS server problems.</p>
<div class="section"><p>DNS offers 12 levels of debug control. Logging usually provides
an easier method of finding problems, but in some cases debugging might be
necessary. Under normal conditions, debugging is turned off (value = 0). It
is recommended that you first use logging to attempt to correct problems.</p>
<p>Valid
debug levels are 0 through 11. Your IBM<sup>®</sup> service representative can help you
determine the appropriate debug value for diagnosing your DNS problem. Values
of 1 or higher write debug information to the NAMED.RUN file in your iSeries™ directory
path: <span class="uicontrol">Integrated File System/Root/QIBM/UserData/OS400/DNS/&lt;server
instance&gt;</span>, where "&lt;server instance&gt;" is the name of the
DNS server instance. The NAMED.RUN file continues to grow as long as the debug
level is set to 1 or higher, and the DNS server continues to run. It is recommended
that you delete the file from time to time to keep it from taking up too much
disk space. You can also use the <span class="uicontrol">Server Properties</span> - <span class="uicontrol">Channels</span> page
to specify preferences for maximum size and number of versions of the NAMED.RUN
file.</p>
<p>To change the debug value for a DNS server instance, follow these
steps:</p>
</div>
<ol><li class="stepexpand"><span>In iSeries Navigator,
expand <span class="menucascade"><span class="uicontrol">your iSeries server</span> &gt; <span class="uicontrol">Network</span> &gt; <span class="uicontrol">Servers</span> &gt; <span class="uicontrol">DNS</span></span>.</span></li>
<li class="stepexpand"><span>In the right pane, right-click <span class="uicontrol">your DNS server</span> and
select <span class="uicontrol">Configuration</span>.</span></li>
<li class="stepexpand"><span>In the DNS configuration window, right-click the DNS server and
select <span class="uicontrol">Properties</span>.</span></li>
<li class="stepexpand"><span>On the Server Properties - General page, specify the server startup
debug level.</span></li>
<li class="stepexpand"><span>If the server is running, stop and restart the server.</span> <div class="note"><span class="notetitle">Note:</span> Changes
to the debug level do not take effect while the server is running. The debug
level set here will be used the next time the server is fully restarted. If
you need to change the debug level while the server is running, see Advanced
DNS features.</div>
</li>
</ol>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakktroubleshooting.htm" title="This topic explains Domain Name System (DNS) logging and debugging settings that can help you resolve problems with your DNS server.">Troubleshoot Domain Name System</a></div>
</div>
<div class="relconcepts"><strong>Related concepts</strong><br />
<div><a href="rzakkmanagingadvanced.htm" title="This topic explains how experienced administrators can use Domain Name System (DNS) advanced features to manage a DNS server more easily.">Advanced Domain Name System features</a></div>
</div>
<div class="reltasks"><strong>Related tasks</strong><br />
<div><a href="rzakktroubleshooting.htm" title="This topic explains Domain Name System (DNS) logging and debugging settings that can help you resolve problems with your DNS server.">Troubleshoot Domain Name System</a></div>
</div>
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