cant create additional dns records

Trying to add an address record:
# samba-tool dns add server.example.local example.local test A 10.169.21.70
Did not manage to negotiate mandetory feature SIGN for dcerpc auth_level 5
Password for [<email address hidden>]:
ERROR(runtime): uncaught exception - (9717, 'WERR_DNS_ERROR_DS_UNAVAILABLE')
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/__init__.py", line 175, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/dns.py", line 1067, in run
    0, server, zone, name, add_rec_buf, None)

If this shall mean the server where unavailable -- hmmmmm:
# ps axf | grep named
 6917 ? Ssl 0:02 /usr/sbin/named -u bind
# ps axf | grep samba
 1001 ? Ss 0:00 samba -D
 1098 ? S 0:00 \_ samba -D
 1099 ? S 0:00 \_ samba -D
 1100 ? S 0:00 \_ samba -D
 1101 ? S 0:00 \_ samba -D
 1102 ? S 0:02 \_ samba -D
 1104 ? S 0:00 \_ samba -D
 1105 ? S 0:00 \_ samba -D
 1106 ? S 0:05 \_ samba -D
 1107 ? S 0:00 \_ samba -D
 1108 ? S 0:00 \_ samba -D
 1109 ? S 0:03 \_ samba -D
 1110 ? S 0:00 \_ samba -D

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: samba 2:4.1.6+dfsg-1ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Fri Apr 25 17:02:06 2014
InstallationDate: Installed on 2012-12-12 (498 days ago)
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
OtherFailedConnect: Yes
ProcEnviron:
 TERM=screen-bce
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SambaServerRegression: No
SmbConfIncluded: Yes
SourcePackage: samba
UpgradeStatus: Upgraded to trusty on 2013-02-11 (437 days ago)