[Samba] problem connecting to shares from Win7 clients - invalid NTLMSSP_MIC

Christian Naumer cn at brain-biotech.de
Thu Nov 17 08:00:15 UTC 2016

There is bug for this:


I am testing this option to resolve this:

client ipc signing = No

But I am not yet sure if it works.



Am Mittwoch, den 16.11.2016, 15:41 -0500 schrieb Sonic via samba:
> Domain users using Windows 7 systems lose the ability to connect to
> Samba shares. Some users can connect one day but then lose the ability
> the next.
> When the problem starts to occur the log.smbd displays:
> ===============================================
>   check_ntlm_password:  authentication for user [user1] -> [user1] ->
> [MYDOMAIN\user1] succeeded
>   ntlmssp_server_postauth: invalid NTLMSSP_MIC for user=[user1]
> domain=[MYDOMAIN] workstation=[MACHINE]
> ===============================================
> The file server in question is running Version 4.5.2-GIT-0d08df6
> The PDC (a different server) is running Version 3.6.24-SerNet-Debian
> Connecting using smbclient from two other Samba installations, one
> running 3.6.22 and one running 3.6.19 work fine.
> The log.smbd just displays the first line from the two above for
> smbclient connections as well as the currently working users from
> their Win7 boxes.
> ===============================================
>   check_ntlm_password:  authentication for user [user1] -> [user1] ->
> [MYDOMAIN\user1] succeeded
> ===============================================
> There is no foillow-up postauth error in these cases.
> Assistance is appreciated.
> Thank you,
> Chris

Dr. Christian Naumer

B.R.A.I.N Aktiengesellschaft
Darmstaedter Str. 34-36, D-64673 Zwingenberg
e-mail cn at brain-biotech.de, homepage www.brain-biotech.de
fon +49-6251-9331-30  /   fax +49-6251-9331-11

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