Good evening.
Jean-Pierre, you were right again : not all LDAP fields were filled. 
I do it with Configuration-->LDAP of the server managerOne reinstallation and restoration of the new backup later, the access to the server-manager works.
I continue my tests: 
- Test of access by samba to the Primary Ibay : not working
 - Test to join the domain : not working
 - In case I do a 
yum update e-smith-samba and everything works, or almost: I can't join the domain because the pc name already exists (normal for me,  it's a pc that is already mounted to the V9.2 domain).
 - I don't know if this has something to do with it but I had downgraded samba on V9.2
https://forums.contribs.org/index.php/topic,54360.0.html
To be continued: 
 - 
signal-event user-delete and db accounts delete to delete the machines and test the mounting to the domain
And everything should be fine after that.
Thanks again to all of you.