[Samba] NTLMv2 can't auth affter Win2003 update

Sense Zeng opaperjam at gmail.com
Tue Mar 17 04:13:52 MDT 2015

And use ntlm_auth fail too:

ntlm_auth --username=testuser
NT_STATUS_LOGON_FAILURE: Logon failure (0xc000006d)

2015-03-17 7:30 GMT+00:00 Sense Zeng <opaperjam at gmail.com>:

> My AD server is Win2003. And my linux server is ubuntu. Samba version is
> 2:3.6.3-2ubuntu2.12 and 2:4.1.6+dfsg-1ubuntu2.14.04.7. They are join into
> the Win2003 AD as normal smb servers (not DC).
> After Win2003 DC autoupdate last week, I can't use smbclient access all
> samba server with NTLMv2:
> ~$ smbclient // -U testuser
> Enter DOMAIN\testuser's password:
> session setup failed: NT_STATUS_LOGON_FAILURE
> But when I set "client NTLMv2 auth = yes" in smb.conf with smbclient, it's
> success to access.
> And wbinfo -a failed with the plaintext password:
> # sudo wbinfo -a DOMAIN\\testuser%password
> plaintext password authentication failed
> Could not authenticate user DOMAIN\\testuser%password with plaintext
> password
> challenge/response password authentication succeeded
> Before Win2003 DC update, everything is just fine. Next list is what
> update had been install:
> KB3032323
> KB3039066
> KB3046049
> KB3033395
> KB3034344
> KB890830
> KB3002657
> KB3035132
> And now not only the samba, Win7 has same NTLM auth problem too. How can I
> fix it?

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