This is only available for local connections.
          See <a class="xref" href="auth-peer.html" title="21.9. Peer Authentication">Section 21.9</a> for details.
         </p></dd><dt><span class="term"><code class="literal">ldap</code></span></dt><dd><p>
          Authenticate using an <acronym class="acronym">LDAP</acronym> server. See <a class="xref" href="auth-ldap.html" title="21.10. LDAP Authentication">Section 21.10</a> for details.
         </p></dd><dt><span class="term"><code class="literal">r