samba - Nov 2017 - Samba4 server is not accessible for logon from Windows 2008R2 SP1.

There is Samba4 4.7.2 acting as standalone server on Ubuntu 14.04.x64.
Also there is Windwos 2008R2 SP1 acting as DC in the same network.
And also Windows XP/7 are in this network.
Logon to Samba4 is accessible from Windows XP and Windowx 7 but not
accessible from Windos 2008R2.
As logon to Windows clients is accessible from Windows 2008R2.
Username and password is asked by Samba and provided from Windows 2008R2
during logon to Samba4 server but it asks username/password again and again
and not accept provided one.
That is logon is unsuccessfull.
The same situation was with Samba4 beginning from 450 version.
Regarding versions prior, don' t remember exactly.
What is the way to solve issue ?

On Sun, 19 Nov 2017 17:47:58 +0300
"CpServiceSPb . via samba" <samba at lists.samba.org> wrote:
> There is Samba4 4.7.2 acting as standalone server on Ubuntu 14.04.x64.
> Also there is Windwos 2008R2 SP1 acting as DC in the same network.
> And also Windows XP/7 are in this network.
> Logon to Samba4 is accessible from Windows XP and Windowx 7 but not
> accessible from Windos 2008R2.
> As logon to Windows clients is accessible from Windows 2008R2.
> Username and password is asked by Samba and provided from Windows
> 2008R2 during logon to Samba4 server but it asks username/password
> again and again and not accept provided one.
> That is logon is unsuccessfull.
> The same situation was with Samba4 beginning from 450 version.
> Regarding versions prior, don' t remember exactly.
> What is the way to solve issue ?
You have provided us with little information to work with, other than
'is not accessible', so it is hard to say why it doesn't work.

A good start would be to post your smb.conf from the 'standalone
server' and for you to see if there is anything in the logs (you may
have to raise the log level).

Rowland