[Samba] suddenly unable to mount shares with hostname

Andreas Oster aoster at novanetwork.de
Wed Nov 9 16:46:12 UTC 2016

Hello all,

my name is Andreas and today I have run into a problem which I am not 
able to fix by myself.

In our company we have a samba file server (Version 4.3.11-Ubuntu) which 
till doday did work without any problems. Unfortunately this is not the 
case anymore. Since today we are no longer able to mount network shares 
on this serverusing the servers dns hostname. The server complains about 
wrong username or password. Using the same credentials but using the 
hosts IP address instead of the DNS name does still work.
The DNS hostname is resolvable. This server is a member server in a 
domain (samba-ad-dc).

Does anyone have an idea what could be the problem ?

here a part of the current smb.conf (real domain name replaced):

         workgroup = EXAMPLE
         realm = EXAMPLE.LOC
         server string = Samba Server %v
         interfaces = eth0
         bind interfaces only = Yes
         server role = member server
         security = ADS
         map to guest = Bad User
         obey pam restrictions = Yes
         log file = /var/log/samba/log.%m
         max log size = 1000
         max xmit = 65535
         printcap name = cups
         os level = 65
         preferred master = Yes
         domain master = No
         dns proxy = No
         panic action = /usr/share/samba/panic-action %d
         template homedir = /iSCSI/homes/%U
         template shell = /bin/bash
         winbind enum users = Yes
         winbind enum groups = Yes
         winbind use default domain = Yes
         winbind refresh tickets = Yes
         idmap config EXAMPLE:backend = rid
         idmap config EXAMPLE:range = 10000-20000
         idmap config *:range = 10000-20000
         idmap config * : backend = tdb
         map acl inherit = Yes
         store dos attributes = Yes
         vfs objects = acl_xattr

         comment = Home Directories
         valid users = %S
         write list = %S +EXAMPLE\Domain-Admins
         force group = "EXAMPLE\Domain-Users"
         group = "EXAMPLE\Domain-Users"
         create mask = 0750
         directory mask = 0750
         directory mode = 0750
         browseable = No

         comment = Temporary auf EXAMPLELX09
         path = /iSCSI/shares/temporary
         admin users = @EXAMPLE\Domain-Admins
         read only = No

         comment = Application auf EXAMPLELX09
         path = /iSCSI/shares/applications
         admin users = @EXAMPLE\Domain-Admins
         read only = No

Thank you for your kind help

best regards

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