Alan:

> Now I am trying to "Configuring my FreeRadius to use ntlm_auth for
> MS-CHAP" to authenticate my NT users, ok ?

 The page does document that.
==> I am trying to following this document.

> After that I configure the radiusd.conf file with the necessary changes
> (about ntlm_auth), I am trying to test the authenticate with a valid
> user of my NT Domain (by radtest) and the FreeRadius reject it.

 radtest doesn't do MS-CHAP.  The page tries to make this clear.
==> Sorry ... but I hadnīt understood it (I thought that just radclient doesnīt work). Now I know that radtest too ...

> The output of my FreeRadiusīs console:
...
>   rad_check_password:  Found Auth-Type System

 You've done rather a lot more than just add "ntlm_auth" to the
"authenticate" section.  This means that the config that previously
worked... now doesn't work.
==> I think this configuration is original (FreeRadius instalationīs). Because, in the previous test this configuration was already there. And the previous test works (Configuring FreeRADIUS to use ntlm_auth)!

  Go back to using the working configuration, and use a client that does
MS-CHAP.  This usually means trying a real login, without using
"radtest" or "radclient".
==> I tried to use the working configuration with a real login, but the behavior is the same, it appears the message that you mencioned: "rad_check_password:  Found Auth-Type System"

Can you help me ?
Best Regards,
Charles.