[Samba] Windows 10 cannot connect without SMB1

Dachshund Digital dachshund-digital at dc.rr.com
Fri Mar 5 01:59:01 UTC 2021


Have have same version of Windows 10 working with Samba.  Version 
information below.  I also have extensive experience with 
virtualization.  Can you itemize your VM environment?  Such as what 
product suite, version, etc.?

Samba Version...
# smbd -V
Version 4.9.5-Debian

 >systeminfo | findstr /B /C:"OS Name" /C:"OS Version"
OS Name:                   Microsoft Windows 10 Pro (20H2) Feature 
Experience Pack 120.2212.551.0
OS Version:                10.0.19042 N/A Build 19042, i.e. 19042.8004

Windows SMB Information...
(Note the SMB dialect is 3.1.1)

 > Get-SmbConnection | Select-Object -Property *
ContinuouslyAvailable : False
Credential            : MicrosoftAccount\[redacted]
Dialect               : 3.1.1
Encrypted             : [redacted]
NumOpens              : 2
Redirected            : False
ServerName            : [redacted]
ShareName             : EasyStore_01
Signed                : False
UserName              : [redacted]
PSComputerName        :
CimClass              : ROOT/Microsoft/Windows/SMB:MSFT_SmbConnection
CimInstanceProperties : {ContinuouslyAvailable, Credential, Dialect, 
CimSystemProperties   : 


On 03/04/2021 12:55, K.R. Foley via samba wrote:
> On 2021-03-03 10:39, K.R. Foley wrote:
>> On 2021-03-02 10:32, K.R. Foley via samba wrote:
>>> On 2021-03-02 10:12, Rowland penny via samba wrote:
>>>> On 02/03/2021 13:55, K.R. Foley via samba wrote:
>>>>> Initially I started testing with two VMs on the same private 
>>>>> network, a Windows client and a Linux VM running Samba 4.11.1. 
>>>>> These VMs were/are not physically isolated, but they are on a 
>>>>> separate subnet with no routing to/from any other subnet. I have 
>>>>> to work in this environment because they are not physical PCs. I 
>>>>> got this working, but it is possible that they might have been 
>>>>> communicating via SMB1. I then brought up an AWS instance because 
>>>>> that is where the initial Samba server will reside (that is why 
>>>>> there are different subnets and the VPN). Configured everything, 
>>>>> but with 4.11.13. In the meantime the Windows VM has been updated. 
>>>>> Now it won't support SMB1 and now my problems start.
>>>>> Last night, I went back to my initial test VM for the Samba 
>>>>> server. The two VMs are on a separate subnet with no routing 
>>>>> to/from any other network and the same problem persists. I get the 
>>>>> exact same errors. The client still thinks that the server is 
>>>>> trying to use SMB1.
>>>>> Again there is no routing between this subnet and any other 
>>>>> subnet. However, the VMs are not physically isolated. This is not 
>>>>> really possible in the current environment. There is an older 
>>>>> Samba NT4 PDC on the same ESXI with the test VMs, but there is no 
>>>>> IP routing and also the domain names are different. Is it possible 
>>>>> that this is causing a problem?
>>>> OK, I have downloaded the latest Win10 ISO, installed it in a VM and
>>>> it joined my Samba 4.13.2 AD domain. I am now of the opinion that it
>>>> is something in your setup that is causing this and I think it may be
>>>> your PDC which relies on two things. SMBv1 and netbios. Netbios does
>>>> not use dns, so this may be replying to the Win10 search for a DC.
>>>> Rowland
>>> Thanks. This evening I am going to try isolating the VMs completely.
>>> If I am unable to isolate them completely, I may just turn off the PDC
>>> momentarily to test. I will report back with my results.
>> Just a quick update on this. I was able to test with a freshly
>> installed Windows 10 VM last night that was not updated to the latest
>> patch and it was able to join the AD without issue.
>> I was not able to isolate the other VM and Samba server last night,
>> but should be able to this evening. So, I will isolate them on a
>> vswitch to see if the old PDC is in fact causing the join problem with
>> the original test VM or if it is something else.
> I have additional results to report. I isolated the initial Windows 10 
> VM and the Samba server VM on a vswitch with no uplink interfaces. I 
> still could not join the Windows 10 VM to the AD. So, it does not 
> appear to be a problem with the old PDC or some outside interference. 
> Just for verification I also took the freshly installed Windows 10 VM 
> and was able to join the AD on that same Samba server VM. So, there is 
> something broken, but at this point it seems to be the something on 
> the Windows VM.
> The freshly installed Windows 10 VM (joins)
> Windows 10 Pro
> 2004
> 19041.804
> The previous Windows 10 VM (doesn't join)
> Windows 10 pro
> 20H2
> 19042.844
> I am not sure if it is the patchlevel of the two VMs or something else 
> causing the problem.
> Thanks.
> kr

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