Best way to transfer a Windows roaming profile on a Samba 4 PDC server

I am migrating a old Samba 3 Primary Domain Controller to a new Samba 4 server, creating a new domain and new users. My Windows 7 test client can correctly join the domain and new users can logon on it. So everything OK.

Now I have to migrate old users' roaming profiles from the old server to the new one, mapping the changes on usernames where it is necessary.

Basically I am following this procedure to migrate profiles:

• make a copy of the [username].V2 profile from the old server to the new [username].V2 on the new server
• change ACL on files and directories on the profile using setfacl
• log the new user on the test client

What I get is that the new user can logon on the test client, and I see in the Samba logs that the client is copying the profile from \server\profiles[username].V2, but after few minutes it automatically log off and the client return to CTRL+ALT+CANC window.

I googled for this problem and I got many hints about a client being attacked by spywares, malwares and so on, but this is not my case as the test client is newly installed.

I cannot find any particular error into the Samba logs.

Other users where I created a new profile from scratch (so I did not migrate an old profile on) can logon correctly without any problem, so the problem should be in the way I migrated the Windows profile.

Do you have any idea? Thanks!