[Samba] Printserver after latest MS updates

[Rowland Penny]

On Tue, 2021-10-19 at 12:30 -0500, Patrick Goetz via samba wrote:
> 
> On 10/19/21 12:10, Jeremy Allison via samba wrote:
> > On Tue, Oct 19, 2021 at 02:37:55PM +0200, cn--- via samba wrote:
> > > Hello you all,
> > > Microsoft is still trying to fix the PrintNightmare bugs. And
> > > after 
> > > the latest patch day we see lots of NTLMv2 auths on our
> > > printserver. 
> > > And _only_ on our printserver and not on any other member
> > > servers.
> > > 
> > > It is not that Kerberos does not work. I can ssh into that
> > > machine 
> > > using Kerberos I can connect with smbclient with kerberos. Also
> > > the 
> > > logs are really spammed with those messages. And it all started
> > > after 
> > > we released the last patchday updates from MS.
> > > This is on RockyLinux with Samba Version 4.14.8 from Sernet. Also
> > > had 
> > > the same Problem on 4.14.7. smb.conf is below.
> > > Everything seems to work as expected. It just is the number of
> > > NTLMv2 
> > > auths that made me look at this more closely.
> > 
> > NTLM auths can happen when a machine isn't using name-based
> > lookups (i.e. not using DNS names). Kerberos requires name-based
> > lookups in order to get tickets. That's usually the cause of
> > NTLM.
> > 
> 
> That comment confused me.  Are you saying that Windows
> authentication 
> will automatically drop down to NTLMv2 if DNS isn't configured
> properly?
> 

Yes, if you read reddit, you will often find 'it was dns' when talking
about AD problems.

Rowland