Hi, I would like to contact you because I have a problem with authentication via SSSD . I explain my problem... I have 2 forest , LESLANDE.LOCAL and ESSONNE.LOCAL. _LESLANDES.LOCAL is composed :_ - srv.LESLANDES.LOCAL /(WS 2012 R2 : AD (+ trust relationship) , DNS (+ DNS Forwarders)./ - client.LESLANDES.LOCAL (CentOS 6.7 : SSSD (sssd-1.12.4-47.el6.x86_64). _ESSONNE.LOCAL is composed :_ - srv.ESSONNE.LOCAL /(WS 2012 R2 : AD (+ trust relationship) , DNS (+ DNS Forwarders)./ Domain users LESLANDES.LOCAL (ex : bwillis(a)LESLANDES.LOCAL) can loggin in a client.LESLANDES.LOCAL but domain users ESSONNE.LOCAL doesn't work .... I have follow and read differents topics but nothing.... https://fedorahosted.org/sssd/wiki/InternalsDocs#a4.2.MultipleDomainsandT... http://jhrozek.livejournal.com/ .... Many thanks, Regard, Anthony. PS : In attachment , detail of project (configuration and logs).