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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Public bug reported:

Clients: Windows 10 Pro 64-bit, Ubuntu 16.04

Client and server samba version:
apt policy samba
samba:
  Installed: 2:4.3.9+dfsg-0ubuntu0.16.04.2
  Candidate: 2:4.3.9+dfsg-0ubuntu0.16.04.2
  Version table:
 *** 2:4.3.9+dfsg-0ubuntu0.16.04.2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     2:4.3.8+dfsg-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

What is expected to happen is by default if one makes a connection via
Ubuntu 16.04 using Nautilus or smbclient to Ubuntu 16.04 samba server,
it automatically negotiates to the highest protocol available from the
samba server (SMB3_11), just like it does when connecting from a Windows
10 client.

What happens instead is via Nautilus or smbclient it consistently
negotiates to NT1, making the share useless from a speed perspective
when connecting over ethernet or 802.11ac.

>From the client:
$ smbclient //192.168.0.107/share

On the server:
$ sudo smbstatus

Samba version 4.3.9-Ubuntu
PID     Username      Group         Machine            Protocol Version       
------------------------------------------------------------------------------
3970      moniker       moniker       192.168.0.101 (ipv4:192.168.0.101:49966) NT1         

Service      pid     machine       Connected at
-------------------------------------------------------
share        3970   192.168.0.101  Sat Jul  2 11:09:09 2016

No locked files

However, if I modify the smbclient as follows it does negotiate to SMB3_11:
smbclient //192.168.0.107/share -m SMB3_11

>From the server:
sudo smbstatus

Samba version 4.3.9-Ubuntu
PID     Username      Group         Machine            Protocol Version       
------------------------------------------------------------------------------
3980      moniker       moniker       192.168.0.101 (ipv4:192.168.0.101:49968) Unknown (0x0311)

Service      pid     machine       Connected at
-------------------------------------------------------
share        3980   192.168.0.101  Sat Jul  2 11:10:34 2016

No locked files

>From the server:
$ smbclient -L localhost
Domain=[WORKGROUP] OS=[Windows 6.1] Server=[Samba 4.3.9-Ubuntu]

	Sharename       Type      Comment
	---------       ----      -------
	print$          Disk      Printer Drivers
	IPC$            IPC       IPC Service (pc server (Samba, Ubuntu))
	share           Disk      
Domain=[WORKGROUP] OS=[Windows 6.1] Server=[Samba 4.3.9-Ubuntu]

	Server               Comment
	---------            -------
	PC                   pc server (Samba, Ubuntu)

	Workgroup            Master
	---------            -------
	WORKGROUP            

The smb.conf file is default with a handful of changes below, not relating to protocol (removing them doesn't change anything). Also, declaring min protocol to be SMB3 causes the share not to be visible by Nautilus:
[global]
encrypt passwords = true
server signing = mandatory
inherit acls = yes
inherit owner = yes
inherit permissions = yes

[share]
path = /home/moniker/Desktop/share
read only = no
guest ok = yes
writeable = yes
browseable = yes

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: samba 2:4.3.9+dfsg-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
Uname: Linux 4.4.0-28-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Sat Jul  2 11:05:33 2016
InstallationDate: Installed on 2015-12-18 (196 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SambaClientRegression: No
SourcePackage: samba
UpgradeStatus: Upgraded to xenial on 2016-01-20 (164 days ago)

** Affects: samba (Ubuntu)
     Importance: High
         Status: Triaged


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1598463

Title:
  samba client negotiates down to NT1 instead of up to SMB3_11, doesn't
  happen with Windows 10 client

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