Centos (httpd/conf.d/ssl.conf) no instruction, Ubuntu (apache2.conf) under instruction.
<IfModule !mod_auth_ntlm_winbind.c>
LoadModule auth_ntlm_winbind_module /usr/lib/apache2/modules/mod_auth_ntlm_winbind.so
</IfModule>
<Directory "/var/www/moodle/auth/ldap/"> <Files ntlmsso_magic.php>
NTLMAuth on
AuthType NTLM
AuthName "Moodle NTLM Authentication"
NTLMAuthHelper "/usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp"
NTLMBasicAuthoritative on
require valid-user
</Files>
</Directory>