[Samba] smbclient ends in NT_STATUS_CONNECTION_REFUSED error

[basti.mueller31 at web.de]

I have applied the changes as suggested. After restarting the server, smbclient-command worked! But after I restarted the Samba Client with „/etc/init.d/samba restart“ I was once again confronted with the same problem! Again, only another server restart did the trick. Now I am facing this problem constantly. As soon as I restart, this command among others won’t work without displaying an error message.
For testing purposes, I have started a new upgrade after uninstalling the bind, using „SAMBA_INTERNAL“ for the Classic Upgrade.
 
The Smb.conf now looks like this:
root at hsad-srv-03:~# cat /etc/samba/smb.conf
# Global parameters
[global]
                workgroup = EXAMPLE
                realm = example.com
                netbios name = PDC
                server role = active directory domain controller
                idmap_ldb:use rfc2307 = yes
                dns forwarder = 8.8.8.8
[netlogon]
                path = /var/lib/samba/sysvol/example.com/scripts
                read only = No
 
[sysvol]
                path = /var/lib/samba/sysvol
                read only = No
root at hsad-srv-03:~#
 
After restarting the server, same problem…
root at server:~# smbclient -L localhost -U%
Domain=[EXAMPLE] OS=[Windows 6.1] Server=[Samba 4.2.14-Debian]
 
                Sharename       Type      Comment
                ---------       ----      -------
                netlogon        Disk     
                sysvol          Disk     
                IPC$            IPC       IPC Service (Samba 4.2.14-Debian)
Domain=[EXAMPLE] OS=[Windows 6.1] Server=[Samba 4.2.14-Debian]
 
                Server               Comment
                ---------            -------
                PDC                  PDC (server)
 
                Workgroup            Master
                ---------            -------
                EXAMPLE            PDC
                WORKGROUP            HSEW-FRH
 
 
root at server:~# samba-tool gpo list Administrator
GPOs for user Administrator
    Default Domain Policy {31B2F340-016D-11D2-945F-00C04FB984F9}
 
As soon as I restart the Samba-Client:


root at server:~# samba-tool gpo list Administrator
ERROR(runtime): uncaught exception - ('Could not find a DC for domain', RuntimeError('NT_STATUS_OBJECT_NAME_NOT_FOUND',))
  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/gpo.py", line 349, in run
    self.url = dc_url(self.lp, self.creds, H)
  File "/usr/lib/python2.7/dist-packages/samba/netcmd/gpo.py", line 117, in dc_url
    raise RuntimeError("Could not find a DC for domain", e)
 
root at server:~# smbclient -d10 -L localhost -U%
INFO: Current debug levels:
  all: 10
  tdb: 10
  printdrivers: 10
  lanman: 10
  smb: 10
  rpc_parse: 10
  rpc_srv: 10
  rpc_cli: 10
  passdb: 10
  sam: 10
  auth: 10
  winbind: 10
  vfs: 10
  idmap: 10
  quota: 10
  acls: 10
  locking: 10
  msdfs: 10
  dmapi: 10
  registry: 10
  scavenger: 10
  dns: 10
  ldb: 10
lp_load_ex: refreshing parameters
Initialising global parameters
INFO: Current debug levels:
  all: 10
  tdb: 10
  printdrivers: 10
  lanman: 10
  smb: 10
  rpc_parse: 10
  rpc_srv: 10
  rpc_cli: 10
  passdb: 10
  sam: 10
  auth: 10
  winbind: 10
  vfs: 10
  idmap: 10
  quota: 10
  acls: 10
  locking: 10
  msdfs: 10
  dmapi: 10
  registry: 10
  scavenger: 10
  dns: 10
  ldb: 10
Processing section "[global]"
doing parameter workgroup = EXAMPLE
doing parameter realm = example.com
doing parameter netbios name = PDC
doing parameter server role = active directory domain controller
doing parameter idmap_ldb:use rfc2307 = yes
doing parameter dns forwarder = 192.168.15.1
pm_process() returned Yes
lp_servicenumber: couldn't find homes
added interface br0 ip=192.168.15.2 bcast=192.168.15.255 netmask=255.255.255.0
Netbios name list:-
my_netbios_names[0]="PDC"
Client started (version 4.2.14-Debian).
Opening cache file at /var/cache/samba/gencache.tdb
Opening cache file at /var/run/samba/gencache_notrans.tdb
sitename_fetch: No stored sitename for EXAMPLE.COM
internal_resolve_name: looking up localhost#20 (sitename (null))
name localhost#20 found.
remove_duplicate_addrs2: looking for duplicate address/port pairs
Connecting to 127.0.0.1 at port 445
Connecting to 127.0.0.1 at port 139
Connection to localhost failed (Error NT_STATUS_CONNECTION_REFUSED)
 
Which information/contents could help? I am clueless!