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<h1>Configuring Maven behind an NTLM proxy</h1>

<p>Maven, by itself, cannot work behind an NTLM proxy (e.g. ISA servers), because this kind of HTTP connection is not supported... at least directly.</p>

<p>But you're not lost, since you can use a &quot;proxy-to-the-proxy&quot;. You have two choices, <a href="http://cntlm.sourceforge.net/">CNTLM</a> and  <a href="http://ntlmaps.sourceforge.net/">NTLM APS</a>.</p>

<h2>Using CNTLM </h2>

<p><a href="http://cntlm.sourceforge.net/">CNTLM</a> is easy to install and configure. Once installed as reported in the website, configure Maven to work with CNTLM, adding this code in your <strong>settings.xml</strong>.</p>

<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
&lt;settings>
  &lt;proxies>
   &lt;proxy>
      &lt;active>true&lt;/active>
      &lt;protocol>http&lt;/protocol>
      &lt;host>127.0.0.1&lt;/host>
      &lt;port>3128&lt;/port>
    &lt;/proxy>
  &lt;/proxies>
&lt;/settings>
</pre></td></tr></table>

<p>Et voilà! Maven works!</p>

<h2>Using NTLM APS</h2>

<p>NTLM has a <a href="http://sourceforge.net/tracker/index.php?func=detail&amp;aid=1647195&amp;group_id=69259&amp;atid=523935">bug with chunked responses</a>, so you have to patch it, so I suggest to use CNTLM.</p>

<p>Anyway, if you want to make NTLM APS work:</p>
<ol>
	<li>download the <a href="http://sourceforge.net/project/showfiles.php?group_id=69259&amp;package_id=134416&amp;release_id=339792">0.9.9.6 version</a> of NTLM APS;</li>
	<li>patch using <a href="http://sourceforge.net/tracker/download.php?group_id=69259&amp;atid=523935&amp;file_id=214176&amp;aid=1647195">this patch</a>;</li>
	<li>run the NTLM APS server;</li>
	<li>configure Maven to work with NTLM APS, adding this code in your <strong>settings.xml</strong>.
<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
&lt;settings>
  &lt;proxies>
   &lt;proxy>
      &lt;active>true&lt;/active>
      &lt;protocol>http&lt;/protocol>
      &lt;host>127.0.0.1&lt;/host>
      &lt;port>5865&lt;/port>
    &lt;/proxy>
  &lt;/proxies>
&lt;/settings
</pre></td></tr></table></li>
</ol>