[Samba] samba 3 protocol smb negotiation failed with samba4.12

[Nick Howitt]

On 15/10/2020 23:16, Jeremy Allison via samba wrote:
> 
> On Thu, Oct 15, 2020 at 12:52:25PM -0500, Dania Ramirez Moya via samba wrote:
>> Hello list:
>> I want to  connect client samba 3.6 to server samba 4.12 but  i have this
>> problem:
>> smbclient -L  10.0.0.2 -U administrator
>> *protocol negotiation failed : NT_STATUS_INVALID_NETWORK_RESPONSE*
>>
>> I know this is about smb version protocol. I have tried some settings but
>> they didn't work.
> 
> Samba 4.12 doesn't allow SMB1 out of the box. Look into setting
> "server min protocol" in the 4.x server smb.conf.
> 
IIRC, Samba 3.6 from some sub-version had "experimental" SMB2 support. 
You could try enabling that. Again, IIRC, it was enabled by setting 
"server max protocol = SMB2". It may be a better option rather than 
lowering the security of Samba 4.12.