Created attachment 9670 [details] debug Samba log I'm using Samba 4.0.1 and SOGo installed and configured Samba is configured as domain controller using the official manual http://www.sogo.nu/files/docs/SOGo%20Native%20Microsoft%20Outlook%20Configuration.pdf When I try to sync Outlook via 135 tcp port samba panics with error: /usr/sbin/samba: Uncaught exception NSInvalidArgumentException, reason: Tried to add nil key to dictionary [2014/02/10 12:45:59, 0] ../lib/util/fault.c:72(fault_report) =============================================================== [2014/02/10 12:45:59, 0] ../lib/util/fault.c:73(fault_report) INTERNAL ERROR: Signal 6 in pid 12924 (4.0.1-4.centos6.1) Please read the Trouble-Shooting section of the Samba HOWTO [2014/02/10 12:45:59, 0] ../lib/util/fault.c:75(fault_report) =============================================================== After error port 135 is closed. Other domain controller services (DNS, LDAP) are ok. Debug samba log in attachment.