samba-mirror/docs-xml/smbdotconf/security/clientntlmv2auth.xml

<samba:parameter name="client ntlmv2 auth"
                 context="G"
				 type="boolean"
                 advanced="1" developer="1"
                 xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
    <para>This parameter determines whether or not <citerefentry><refentrytitle>smbclient</refentrytitle>
    <manvolnum>8</manvolnum></citerefentry> will attempt to
    authenticate itself to servers using the NTLMv2 encrypted password
    response.</para>

    <para>If enabled, only an NTLMv2 and LMv2 response (both much more
    secure than earlier versions) will be sent.  Older servers
    (including NT4 &lt; SP4, Win9x and Samba 2.2) are not compatible with
    NTLMv2 when not in an NTLMv2 supporting domain</para>

    <para>Similarly, if enabled, NTLMv1, <command
    moreinfo="none">client lanman auth</command> and <command
    moreinfo="none">client plaintext auth</command>
    authentication will be disabled.  This also disables share-level 
    authentication. </para>

    <para>If disabled, an NTLM response (and possibly a LANMAN response)
    will be sent by the client, depending on the value of <command
    moreinfo="none">client lanman auth</command>.  </para>

    <para>Note that Windows Vista and later versions already use
    NTLMv2 by default, and some sites (particularly those following
    'best practice' security polices) only allow NTLMv2 responses, and
    not the weaker LM or NTLM.</para>
</description>
<value type="default">yes</value>
</samba:parameter>