[Samba] Samba4 - Cannot contact any KDC for requested realm

Daniele Manfredi dmanfredi at rta.it
Tue Mar 22 13:35:16 UTC 2016


Good afternoon,
I have installed a fileserver with samba4 environment.
This is configured to works as AD-DC even if I only use it as a 
fileserver (at the moment).
All seems to works fine but, every 10 minutes, the log print these messages:

Mar 22 11:53:17 fileserver samba[1946]: [2016/03/22 11:53:17.557554,  0] 
../lib/util/util_runcmd.c:324(samba_runcmd_io_handler)
Mar 22 11:53:17 fileserver samba[1946]: 
/usr/local/samba/sbin/samba_dnsupdate: Traceback (most recent call last):
Mar 22 11:53:17 fileserver samba[1946]: [2016/03/22 11:53:17.557717,  0] 
../lib/util/util_runcmd.c:324(samba_runcmd_io_handler)
Mar 22 11:53:17 fileserver samba[1946]: 
/usr/local/samba/sbin/samba_dnsupdate:   File 
"/usr/local/samba/sbin/samba_dnsupdate", line 614, in <module>
Mar 22 11:53:17 fileserver samba[1946]: [2016/03/22 11:53:17.557790,  0] 
../lib/util/util_runcmd.c:324(samba_runcmd_io_handler)
Mar 22 11:53:17 fileserver samba[1946]: 
/usr/local/samba/sbin/samba_dnsupdate:     get_credentials(lp)
Mar 22 11:53:17 fileserver samba[1946]: [2016/03/22 11:53:17.557825,  0] 
../lib/util/util_runcmd.c:324(samba_runcmd_io_handler)
Mar 22 11:53:17 fileserver samba[1946]: 
/usr/local/samba/sbin/samba_dnsupdate:   File 
"/usr/local/samba/sbin/samba_dnsupdate", line 125, in get_credentials
Mar 22 11:53:17 fileserver samba[1946]: [2016/03/22 11:53:17.557867,  0] 
../lib/util/util_runcmd.c:324(samba_runcmd_io_handler)
Mar 22 11:53:17 fileserver samba[1946]: 
/usr/local/samba/sbin/samba_dnsupdate:     raise e
Mar 22 11:53:17 fileserver samba[1946]: [2016/03/22 11:53:17.557896,  0] 
../lib/util/util_runcmd.c:324(samba_runcmd_io_handler)
Mar 22 11:53:17 fileserver samba[1946]: 
/usr/local/samba/sbin/samba_dnsupdate: RuntimeError: kinit for 
FILESERVER$@MYDOMAIN.IT failed (Cannot contact any KDC for requested realm)
Mar 22 11:53:17 fileserver samba[1946]: [2016/03/22 11:53:17.557967,  0] 
../lib/util/util_runcmd.c:324(samba_runcmd_io_handler)
Mar 22 11:53:17 fileserver samba[1946]: 
/usr/local/samba/sbin/samba_dnsupdate:


Following, some configuration files that may help you to understand the 
problem.

/etc/krb5.conf and /usr/local/samba/private/krb5.conf:

[libdefaults]
         default_realm = MYDOMAIN.IT
         dns_lookup_realm = false
         dns_lookup_kdc = true

smb.conf

# Global parameters
[global]
         realm = mydomain.it
         server role = active directory domain controller
         server services = -dns
         printcap name = /dev/null
         unix extensions = no
         printing = bsd
         dns forwarder = 8.8.8.8
         workgroup = MYDOMAIN
         os level = 255
         interfaces = 192.168.0.221/255.255.255.0
         load printers = no
         netbios name = FILESERVER
         winbind use default domain = yes
         winbind trusted domains only = no

Thank you in advance for your help.
Daniele





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