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<div class="titlepage"><div><div><h1 class="title">
<a name="Bv9ARM.ch08"></a>Chapter�8.�Troubleshooting</h1></div></div></div>
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<p><b>Table of Contents</b></p>
<dl class="toc">
<dt><span class="section"><a href="Bv9ARM.ch08.html#common_problems">Common Problems</a></span></dt>
<dd><dl><dt><span class="section"><a href="Bv9ARM.ch08.html#id-1.9.2.2">It's Not Working; How Can I Figure Out What's Wrong?</a></span></dt></dl></dd>
<dt><span class="section"><a href="Bv9ARM.ch08.html#id-1.9.3">Incrementing and Changing the Serial Number</a></span></dt>
<dt><span class="section"><a href="Bv9ARM.ch08.html#more_help">Where Can I Get Help?</a></span></dt>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="common_problems"></a>Common Problems</h2></div></div></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="id-1.9.2.2"></a>It's Not Working; How Can I Figure Out What's Wrong?</h3></div></div></div>
<p>
The best solution to installation and
configuration issues is to take preventive measures by setting
up logging files beforehand. The log files provide a
source of hints and information that can be used to identify
what went wrong and fix the problem.
</p>
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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.9.3"></a>Incrementing and Changing the Serial Number</h2></div></div></div>
<p>
Zone serial numbers are just numbers — they are not
date-related. However, many people set them to a number that
represents a date, usually of the form YYYYMMDDRR.
Occasionally they make a mistake and set the serial number to a
date in the future, then try to correct it by setting
it to the current date. This causes problems because
serial numbers are used to indicate that a zone has been
updated. If the serial number on the secondary server is
lower than the serial number on the primary, the secondary
server attempts to update its copy of the zone.
</p>
<p>
Setting the serial number to a lower number on the primary
server than the one on the secondary server means that the secondary will not perform
updates to its copy of the zone.
</p>
<p>
The solution to this is to add 2147483647 (2^31-1) to the
number, reload the zone and make sure all secondaries have updated to
the new zone serial number, then reset it to the desired number
and reload the zone again.
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="more_help"></a>Where Can I Get Help?</h2></div></div></div>
<p>
The BIND-users mailing list, at https://lists.isc.org/mailman/listinfo/bind-users,
is an excellent resource for peer user support. In addition, <acronym class="acronym">ISC</acronym> maintains a
Knowledgebase of helpful articles at https://kb.isc.org.
</p>
<p>
Internet Systems Consortium
(<acronym class="acronym">ISC</acronym>) offers annual
support agreements for <acronym class="acronym">BIND</acronym>9, ISC <acronym class="acronym">DHCP</acronym>, and Kea DHCP.
All paid support contracts include advance security notifications; some levels include
service level agreements (SLAs), premium software features, and increased priority on bug fixes
and feature requests.
</p>
<p>
Please contact
<a class="link" href="mailto:info@isc.org" target="_top">info@isc.org</a> or visit
<a class="link" href="https://www.isc.org/contact/" target="_top">https://www.isc.org/contact/</a>
for more information.
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<td width="40%" align="left" valign="top">Chapter�7.�<acronym class="acronym">BIND</acronym> 9 Security Considerations�</td>
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<td width="40%" align="right" valign="top">�Appendix�A.�Release Notes</td>
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<p xmlns:db="http://docbook.org/ns/docbook" style="text-align: center;">BIND 9.11.36 (Extended Support Version)</p>
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