[Samba] Samba4 machine fails to join in samba3 domain

[Julien TEHERY]

Le 22/05/2019 à 17:40, Julien TEHERY via samba a écrit :
> Louis is right, you should upgrade, but, in the meantime, try adding 
> 'ntlm auth = yes' to your smb.conf, see if that helps.
>>
>> Also try running the following commands:
>>
>> net getlocalsid
>>
>> net getdomainsid
>>
>> Rowland
>>
> Yes they should upgrade, I totally agree. I've allready migrated 
> samba3 domain to samba4 domain , but in this case the samba4 one is 
> only a fileserver that was joined in a microsoft/AD domain. People 
> from the samba3 domain used to access their home on it through 
> bidirectionnal approbation approval between the microsoft domain and 
> samba3 domain.
> Now they have to break this approval to upgrade their forest 
> functionnal level. That's why we try to integrate this samba4 
> fileserver into the old samba3 domain, so that users can still have 
> access to their homes.
>
> I tried with the ntlm_auth option whitout success.
>
> I won't bother your with samba3 problems, but can somebody explain 
> what root's SID has to deal with the "net rpc join" command?
> I precise this SID does exists in the samba3 (target) domain and the 
> SID is the same as shown in my first email.
>
Sorry i forgot to answer:

net getlocalsid
SID for domain FS04B is: S-1-5-21-3343141187-492064944-XXXXXXXXXX

Domain SID was empty
net getdomainsid
SID for local machine MYSERVER is: S-1-5-21-3343141187-492064944-XXXXXXXXXX
Could not fetch domain SID

So i tried to force it
net setdomainsid S-1-5-21-2143421583-854681893-XXXXXXXXXX

net getdomainsid
SID for local machine MYSERVER is: S-1-5-21-3343141187-492064944-XXXXXXXXXX
SID for domain MYDOMAIN is: S-1-5-21-2143421583-854681893-620655208

bu didn't help