Hello, I've set up a test environment with Samba 4.0.9 as AD DC and noticed these messages in */var/log/messages* and *log.samba* *Sep 8 19:36:09 samba samba[15867]: [2013/09/08 19:36:09.840914, 0] ../source4/dsdb/kcc/kcc_periodic.c:664(kccsrv_samba_kcc) Sep 8 19:36:09 samba samba[15867]: Calling samba_kcc script Sep 8 19:36:10 samba abrt: detected unhandled Python exception in '/usr/local/samba/sbin/samba_kcc' Sep 8 19:36:10 samba abrtd: New client connected Sep 8 19:36:10 samba abrtd: Directory 'pyhook-2013-09-08-19:36:10-15875' creation detected Sep 8 19:36:10 samba abrt-server[15878]: Saved Python crash dump of pid 15875 to /var/spool/abrt/pyhook-2013-09-08-19:36:10-15875 Sep 8 19:36:10 samba samba[15867]: [2013/09/08 19:36:10.114975, 0] ../lib/util/util_runcmd.c:317(samba_runcmd_io_handler) Sep 8 19:36:10 samba samba[15867]: /usr/local/samba/sbin/samba_kcc: close failed in file object destructor: Sep 8 19:36:10 samba samba[15867]: [2013/09/08 19:36:10.115305, 0] ../lib/util/util_runcmd.c:317(samba_runcmd_io_handler) Sep 8 19:36:10 samba samba[15867]: /usr/local/samba/sbin/samba_kcc: IOError: [Errno 10] No child processes Sep 8 19:36:10 samba samba[15867]: [2013/09/08 19:36:10.125229, 0] ../lib/util/util_runcmd.c:317(samba_runcmd_io_handler) Sep 8 19:36:10 samba samba[15867]: /usr/local/samba/sbin/samba_kcc: close failed in file object destructor: Sep 8 19:36:10 samba samba[15867]: [2013/09/08 19:36:10.125329, 0] ../lib/util/util_runcmd.c:317(samba_runcmd_io_handler) Sep 8 19:36:10 samba samba[15867]: /usr/local/samba/sbin/samba_kcc: IOError: [Errno 10] No child processes Sep 8 19:36:10 samba abrtd: Executable '/usr/local/samba/sbin/samba_kcc' doesn't belong to any package Sep 8 19:36:10 samba abrtd: 'post-create' on '/var/spool/abrt/pyhook- 2013-09-08-19:36:10-15875' exited with 1 Sep 8 19:36:10 samba abrtd: Corrupted or bad directory '/var/spool/abrt/pyhook-2013-09-08-19:36:10-15875', deleting* This is a clean installation, the DNS is samba's internal pointing to google 8.8.8.8. There is only 1 client, windows 7 with RSAT tools that accesses the server. This error pops up *precisely* *every 5 minutes*. I did not encounter this with Samba 4.0.7. It does not seem to affect the server in anyway until now, but I am curios what it means and why every 5 minutes. Any ideas ? Thanks, George