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<title>Frequently Asked Questions - Apache HTTP Server</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.0</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">FAQ</a></div><div id="page-content"><div id="preamble"><h1>Frequently Asked Questions</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/faq/all_in_one.html" title="English"> en </a> |
<a href="../ko/faq/all_in_one.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div>
<p>The latest version of this FAQ is always available from the main Apache
web site, at <<a href="http://httpd.apache.org/docs/2.0/faq/">http://httpd.apache.org/docs/2.0/faq/</a>>.</p>
<p>Since Apache 2.0 is quite new, we don't yet know what the <em>Frequently
Asked Questions</em> will be. While this section fills up, you should also
consult the <a href="http://httpd.apache.org/docs/misc/FAQ.html">Apache 1.3
FAQ</a> to see if your question is answered there.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#topics">Topics</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#support">Support</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#error">Error Messages</a></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a id="topics" name="topics">Topics</a></h2>
<dl><dt><a href="#support">Support</a></dt><dd>What do I do when I have problems?</dd>
<dt><a href="#error">Error Messages</a></dt><dd>What does this error message mean?</dd>
</dl></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="support" id="support">Support</a></h2>
<ul>
<li><a href="#support.what2do">"Why can't I ...? Why won't ... work?" What
to do in case of problems</a></li>
<li><a href="#support.support">Whom do I contact for support?</a></li>
</ul>
<h3><a name="support.what2do" id="support.what2do">"Why can't I ...? Why won't ... work?" What to do in case of
problems</a></h3>
<p>If you are having trouble with your Apache server software, you should
take the following steps:</p>
<dl>
<dt>Check the errorlog!</dt>
<dd>Apache tries to be helpful when it encounters a problem. In many
cases, it will provide some details by writing one or messages to the
server error log. Sometimes this is enough for you to diagnose & fix
the problem yourself (such as file permissions or the like). The default
location of the error log is
<code>/usr/local/apache2/logs/error_log</code>, but see the <code class="directive"><a href="../mod/core.html#errorlog">ErrorLog</a></code> directive in your config files for the
location on your server.</dd>
<dt>Check the <a href="http://httpd.apache.org/docs/2.0/faq/">FAQ</a>!</dt>
<dd>The latest version of the Apache Frequently-Asked Questions list can
always be found at the main Apache web site.</dd>
<dt>Check the Apache bug database</dt>
<dd>Most problems that get reported to The Apache Group are recorded in
the <a href="http://httpd.apache.org/bug_report.html">bug database</a>.
<strong>Please</strong> check the existing reports, open
<strong>and</strong> closed, before adding one. If you find that your
issue has already been reported, please <em>don't</em> add a "me, too"
report. If the original report isn't closed yet, we suggest that you
check it periodically. You might also consider contacting the original
submitter, because there may be an email exchange going on about the
issue that isn't getting recorded in the database.</dd>
<dt><a id="support.what2do.user-support" name="support.what2do.user-support">Ask in a user support forum</a></dt>
<dd><p>Apache has an active community of users who are willing to share
their knowledge. Participating in this community is usually the best and
fastest way to get answers to your questions and problems.</p>
<p><a href="http://httpd.apache.org/userslist.html">Users
mailing list</a></p>
<p>USENET newsgroups:</p>
<ul>
<li>comp.infosystems.www.servers.unix
[<a href="news:comp.infosystems.www.servers.unix">news</a>]
[<a href="http://groups.google.com/groups?group=comp.infosystems.www.servers.unix">google</a>]
</li>
<li>comp.infosystems.www.servers.ms-windows
[<a href="news:comp.infosystems.www.servers.ms-windows">news</a>]
[<a href="http://groups.google.com/groups?group=comp.infosystems.www.servers.ms-windows">google</a>]
</li>
<li>comp.infosystems.www.authoring.cgi
[<a href="news:comp.infosystems.www.authoring.cgi">news</a>]
[<a href="http://groups.google.com/groups?group=comp.infosystems.www.authoring.cgi">google</a>]
</li>
</ul></dd>
<dt>If all else fails, report the problem in the bug database</dt>
<dd><p>If you've gone through those steps above that are appropriate and
have obtained no relief, then please <em>do</em> let the httpd developers
know about the problem by <a href="http://httpd.apache.org/bug_report.html">logging a bug
report</a>.</p>
<p>If your problem involves the server crashing and generating a core
dump, please include a backtrace (if possible). As an example,</p>
<div class="example"><p><code>
# cd <var>ServerRoot</var><br />
# dbx <var>httpd</var> <var>core</var><br />
(dbx) where
</code></p></div>
<p>(Substitute the appropriate locations for your <var>ServerRoot</var>
and your <var>httpd</var> and <var>core</var> files. You may have to use
<code>gdb</code> instead of <code>dbx</code>.)</p>
</dd>
</dl>
<h3><a name="support.support" id="support.support">Whom do I contact for support?</a></h3>
<p>With several million users and fewer than forty volunteer developers,
we cannot provide personal support for Apache. For free support, we
suggest participating in a <a href="#support.what2do.user-support">user forum</a>.</p>
<p>Professional, commercial support for Apache is available from
<a href="http://www.apache.org/info/support.cgi">a number of
companies</a>.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="error" id="error">Error Messages</a></h2>
<ul>
<li><a href="#error.sendfile">Invalid argument:
core_output_filter: writing data to the network</a></li>
<li><a href="#error.acceptex">AcceptEx failed</a></li>
<li><a href="#error.scriptheaders">Premature end of script
headers</a></li>
</ul>
<h3><a name="error.sendfile" id="error.sendfile">Invalid argument:
core_output_filter: writing data to the network</a></h3>
<p>Apache uses the <code>sendfile</code> syscall on platforms
where it is available in order to speed sending of responses.
Unfortunately, on some systems, Apache will detect the presence of
<code>sendfile</code> at compile-time, even when it does not work
properly. This happens most frequently when using network or
other non-standard file-system.</p>
<p>Symptoms of this problem include the above message in the error
log and zero-length responses to non-zero-sized files. The
problem generally occurs only for static files, since dynamic
content usually does not make use of <code>sendfile</code>.</p>
<p>To fix this problem, simply use the <code class="directive"><a href="../mod/core.html#enablesendfile">EnableSendfile</a></code> directive to disable
<code>sendfile</code> for all or part of your server. Also see
the <code class="directive"><a href="../mod/core.html#enablemmap">EnableMMAP</a></code>, which can
help with similar problems.</p>
<h3><a name="error.acceptex" id="error.acceptex">AcceptEx Failed</a></h3>
<p>If you get error messages related to the <code>AcceptEx</code> syscall
on win32, see the <code class="directive"><a href="../mod/mpm_winnt.html#win32disableacceptex">Win32DisableAcceptEx</a></code>
directive.</p>
<h3><a name="error.scriptheaders" id="error.scriptheaders">Premature end of script
headers</a></h3>
<p>Most problems with CGI scripts result in this message written in the
error log together with an <code>Internal Server Error</code> delivered
to the browser. A guide to helping debug this type of problem is
available in the <a href="../howto/cgi.html#troubleshoot">CGI
tutorial</a>.</p>
</div></div>
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<p><span>Available Languages: </span><a href="../en/faq/all_in_one.html" title="English"> en </a> |
<a href="../ko/faq/all_in_one.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
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<p class="apache">Copyright 2006 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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