[Samba] Fwd: Cannot connect to Samba share (4.1.11) from Windows 10

[Adrien Husson]

Hi!

I have a Samba server version 4.1.11 running on Ubuntu Server 14.04. I
cannot connect from Windows 10 (but I can from Windows 7).

The server and the clients are not on the same LAN.

The error message given by Windows is that the server is online but
not responding. However the Samba logs say otherwise.

I have attached the logs for a failed connection attempt from Windows
10, and those for a successful attempt from Windows 7 (for
comparison).

Briefly, unlike the successful attempt, the failed one starts with:

switch message SMBnegprot (pid 2855) conn 0x0

then it requests a number of different protocols before selecting
SMB2_FF. Then, after some security negotiations, it switches to
protocol SMB 2.???, then SMB3_00, followed by:

Server exit (NT_STATUS_END_OF_FILE).

The successful attempt selects protocol SMB2_10 from the start, but
this protocol is not even requested by Windows 10.

Here are the logs :

Failed attempt (from Windows 10)
http://pastebin.com/M0xmBuY3

Successful attempt (from Windows 7)
http://pastebin.com/jF8VzaiA

smb.conf
http://pastebin.com/CWYqGuBa

[soonerdave]

Windows 10 will try to negotiate SMB3_11, which Samba4 doesn't yet support
except in the current 4.3 release candidate. I suspect for now disabling
SMB2/3 on the Windows 10 client is your best, if not ideal, option.

Instructions for doing.this can be found
here:https://support.microsoft.com/en-us/kb/2696547



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[L.P.H. van Belle]

Hai,

In my test i did not do anything but join the domain with windows 10,
worked fine.

Tested here at my office, and at home.

Environments:
Office,
Debian Wheezy Samba 4 ADDC's, sernet samba 4.2.3
Member servers wheezy and Jessie, debian samba 4.1.17 and sernet samba 4.2.3

At home
Ubuntu 14.04 sernet samba 4.2.3
A standalone server with shares open, no auth.

I suggest upgrade you samba version first, before messing up your windows.
If you cant access you server with \\servername try \\servername.domain.tld


Greetz,

Louis

-----Oorspronkelijk bericht-----
Verzonden: maandag 7 september 2015 15:52
Onderwerp: Re: [Samba] Fwd: Cannot connect to Samba share (4.1.11) from
Windows 10
Windows 10 will try to negotiate SMB3_11, which Samba4 doesn't yet support
except in the current 4.3 release candidate. I suspect for now disabling
SMB2/3 on the Windows 10 client is your best, if not ideal, option.
Instructions for doing.this can be found
here:https://support.microsoft.com/en-us/kb/2696547
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tp4690894p4690934.html
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[David Whitney]

That's great, Adrien! I'm glad this was helpful for you. It at least keeps
you from having to drop the DC's security level to NT1 :)

Post by soonerdave
I suspect for now disabling
SMB2/3 on the Windows 10 client is your best, if not ideal, option.
Instructions for doing.this can be found
here:https://support.microsoft.com/en-us/kb/2696547

Thank you very much, it worked!