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ntlm_auth sending ERR to squid when it shouldn't

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ntlm_auth seems to be sending ERR to squid when it shouldn't.  I have
two users below that should both work but one doesn't.  Any help
understanding where I've gone wrong is appreciated.

Let's look at this...

THIS WORKED:
###########################################################
Got SMBIZ+workinguser "SMBIZ+Internet Full" from squid
User:  -SMBIZ+workinguser-
Group: -SMBIZ+Internet Full-
SID:   -S-1-5-21-2732840889-2280141153-3048588358-1688 Domain Group (2)-
GID:   -16777253-
Sending OK to squid


THIS FAILED:
###########################################################
Got SMBIZ+failinguser "SMBIZ+Internet Full" from squid
User:  -SMBIZ+failinguser-
Group: -SMBIZ+Internet Full-
SID:   -S-1-5-21-2732840889-2280141153-3048588358-1688 Domain Group (2)-
GID:   -16777253-
Sending ERR to squid


Let's look at the first case...

The auth script got "SMBIZ+Internet Full" as the group.  Let's see
what the SID is for that:

[root@inferno squid]# wbinfo -n "SMBIZ+Internet Full"
S-1-5-21-2732840889-2280141153-3048588358-1688 Domain Group (2)

O.K. Now let's see what the GID for that SID is:

[root@inferno squid]# wbinfo -Y S-1-5-21-2732840889-2280141153-3048588358-1688
16777253

That looks right.  Now let's get the list of groups that workinguser is in:

[root@inferno squid]# wbinfo -r SMBIZ+workinguser
16777216
16777222
16777223
16777252
16777253 <<<<<<
16777255
16777256

So, workinguser is showing in the group that we are interested in. 
Let's look at the test user:

[root@inferno squid]# wbinfo -r SMBIZ+failinguser
16777216
16777251
16777253 <<<<<<

He is also in that group so this should have worked also.  Right?

NTLM SETTINGS
###########################################################
auth_param ntlm program /usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param ntlm children 15
auth_param ntlm use_ntlm_negotiate on

Thanks!
--
Gabriel Gunderson
http://gundy.org


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