[Samba] lookup_name_smbconf for <user> failed

[Rowland Penny]

On Fri, 22 Feb 2019 18:11:05 +0100
Hans Schou via samba <samba at lists.samba.org> wrote:

> On Fri, 22 Feb 2019 at 17:46, Rowland Penny via samba
> <samba at lists.samba.org> wrote:
> 
> > On Fri, 22 Feb 2019 17:41:50 +0100
> > Hans Schou via samba <samba at lists.samba.org> wrote:
> >
> > > On Fri, 22 Feb 2019 at 17:27, Rowland Penny via samba
> > > <samba at lists.samba.org> wrote:
> > >
> > >
> > > > > [global]
> > > > >         log level = 3
> > > > >         unix charset = UTF8
> > > > >         dos charset = ISO-8859-1
> > > > >         workgroup = ACME.DOM
> > > >
> > > > Sorry, but you cannot use a workgroup with a dot in it.
> > > >
> > >
> > > I tried to remove ".DOM" but then I can not start smb so I added
> > > it again. Maybe it is defined that way on the Domain Controller?
> > >
> > >
> >
> > It probably is, but it is wrong, what is the DC ?
> >
> 
> Im not sure what your question is but if I run these commands on the
> windows computer it this:
> 
> C:\Windows\System32>echo %USERDOMAIN%
> ACME.DOM
> 
> C:\Windows\System32>echo %USERDNSDOMAIN%
> ACME.COM
> 

The above answered my question, it is some form of Windows AD DC.

> When going to File Explorer -> This PC -> Properties
> the value to "Domain:" is "acme.com"
> 
> Some part of this network installation dates back to 1995 so maybe
> somebody thaught it was a good idea.
> 
> Microsoft says "period" is for special purpose
> https://support.microsoft.com/en-au/help/909264/naming-conventions-in-active-directory-for-computers-domains-sites-and
> 

There have been numerous problems reported on here that were caused by
using a workgroup name with a dot in it. It can too easily be mixed up
with a dns domain. It also doesn't help that 'domain' can be used for
a couple of things:
It can be used for the DNS domain
It can be used for NETBIOS domain name (aka workgroup), which itself
shouldn't be mixed up with the NETBios name, which is the computers
shorthost name in uppercase. 

If it is historic, then you are stuck with it.

Rowland