[Samba] ntlm

[Greg Marshall]

Hello experts/users,

We have a samba server in ubuntu 18.04 LTS with version.

apt-cache policy samba
samba:
  Installed: 2:4.7.6+dfsg~ubuntu-0ubuntu2.16
  Candidate: 2:4.7.6+dfsg~ubuntu-0ubuntu2.16

All is fine and great. Except one (internet disabled) windows 7
professional PC (sorry we still need to run it for a scientific tool)
cannot connect unless I put "ntlm auth = yes" in smb.conf

Funnily other (no internet) windows 7 clients work OK.
I have two questions

1. What need to be changed in registry of this not working windows 7
client.  (It was a preinstalled machine from vendor - we cannot
reinstall).

2. BTW is this ntlm auth = yes can anyway cause wannacry type issues?
Many thanks
greg

smb.conf

[global]
   server string = SPR Server
   server role = standalone server
   bind interfaces only = yes
   interfaces = lo eno1
   disable netbios = no
   max log size = 1000
   log level = 1
   security = user
   server role = standalone server
   passdb backend = tdbsam
   obey pam restrictions = no
   unix password sync = yes
   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\s*\spassword:* %n\n
*Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
   pam password change = yes
   map to guest = Bad User
   client min protocol = SMB2
 ntlm auth = yes
vfs objects = catia fruit streams_xattr
fruit:aapl = yes
fruit:encoding = native
fruit:locking = none
fruit:metadata = stream
fruit:resource = file