samba - Oct 2012 - ntlm_auth - No logon workstation trust account

Hi,

I've been trying to get machine auth working with Freeradius for a good
while and I'm currently stuck trying to figure out why samba's ntlm_auth
is
returning "No logon workstation trust account (0xc0000199)".

 I've double checked Active Directory and the account definitely exists,
and the machine has no problem logging into the domain. User auth works
fine.

Here's an example command:

    /usr/bin/ntlm_auth --request-nt-key --username=NOLP3003$ --domain=FOO
--challenge=4a8904ffb0ba86d2
--nt-response=7ab480ea0a0754603629da316c9911935ff3c92daffcc621
    No logon workstation trust account (0xc0000199)

ntlm_auth is version 3.6.1-34.3.1-2691-SUSE-SL12.1-x86_64

Does anyone have any suggestions?

Thanks in advance,

Bryce