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<title>mod_ident - Apache HTTP Server Version 2.4</title>
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<div id="preamble"><h1>Apache Module mod_ident</h1>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>RFC 1413 ident lookups</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">ModuleIdentifier:</a></th><td>ident_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">SourceFile:</a></th><td>mod_ident.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.1 and later</td></tr></table>
<h3>Summary</h3>
<p>This module queries an <a href="http://www.ietf.org/rfc/rfc1413.txt">RFC 1413</a> compatible daemon on a remote host to look up the owner of
a connection.</p>
</div>
<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#identitycheck">IdentityCheck</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#identitychecktimeout">IdentityCheckTimeout</a></li>
</ul>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_ident">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_ident">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code></li>
<li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="directive-section"><h2><a name="IdentityCheck" id="IdentityCheck">IdentityCheck</a> <a name="identitycheck" id="identitycheck">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables logging of the RFC 1413 identity of the remote
user</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>IdentityCheck On|Off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>IdentityCheck Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ident</td></tr>
<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Moved out of core in Apache 2.1</td></tr>
</table>
<p>This directive enables <a href="http://www.ietf.org/rfc/rfc1413.txt">RFC 1413</a>-compliant logging of the remote user name for each
connection, where the client machine runs identd or something similar.
This information is logged in the access log using the <code>%...l</code>
<a href="mod_log_config.html#formats">format string</a>.</p>
<div class="note">
The information should not be trusted in any way except for
rudimentary usage tracking.
</div>
<p>Note that this can cause serious latency problems accessing
your server since every request requires one of these lookups
to be performed. When firewalls or proxy servers are involved,
each lookup might possibly fail and add a latency duration as
defined by the <code class="directive"><a href="#identitychecktimeout">IdentityCheckTimeout</a></code> directive to each hit. So in
general this is not very useful on public servers accessible from
the Internet.</p>
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<div class="directive-section"><h2><a name="IdentityCheckTimeout" id="IdentityCheckTimeout">IdentityCheckTimeout</a> <a name="identitychecktimeout" id="identitychecktimeout">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Determines the timeout duration for ident requests</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>IdentityCheckTimeout <var>seconds</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>IdentityCheckTimeout 30</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_ident</td></tr>
</table>
<p>This directive specifies the timeout duration of an ident
request. The default value of 30 seconds is recommended by <a href="http://www.ietf.org/rfc/rfc1413.txt">RFC 1413</a>, mainly because
of possible network latency. However, you may want to adjust the
timeout value according to your local network speed.</p>
</div>
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