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</div><div id="page-content"><div id="preamble"><h1>Error Messages - Frequently Asked Questions</h1>
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<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>
    

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