samba - Apr 2016 - client ldap sasl wrapping = plain

Hello,

i've a nice behaviour here. I have to samba4 clients in the same AD 
domain, with the same smb.conf, but different OS
and different Samba Versions.

On one host i must set the $subject parameter and on one not. I'm not 
sure, why this happens?

Host without this parameter:

SuSE SLES 12
Samba 4.2.3 (sernet)

Host with this paramter

debian 8
Samba 4.2 (debian)

Any idea?

Regards, Dirk