➜  samba  samba -i -M single
samba version 4.1.12-SerNet-Debian-9.wheezy started.
Copyright Andrew Tridgell and the Samba Team 1992-2013
samba: using 'single' process model
/usr/sbin/samba_dnsupdate: Traceback (most recent call last):
/usr/sbin/samba_dnsupdate:   File "/usr/sbin/samba_dnsupdate", line 612, in <module>
/usr/sbin/samba_dnsupdate:     get_credentials(lp)
/usr/sbin/samba_dnsupdate:   File "/usr/sbin/samba_dnsupdate", line 125, in get_credentials
/usr/sbin/samba_dnsupdate:     raise e
/usr/sbin/samba_dnsupdate: RuntimeError: kinit for THOR$@TETRA.INT failed (Cannot contact any KDC for requested realm)
/usr/sbin/samba_dnsupdate:
../source4/dsdb/dns/dns_update.c:294: Failed DNS update - NT_STATUS_ACCESS_DENIED