Samba AD DC Troubleshooting

Revision as of 22:43, 11 October 2016 by Mmuehlfeld (talk | contribs) (Added categories to group the content)


This page will help to find & cure common problems that may occur when setting up or running a Samba AD Domain Controller.


Setting the Samba Log Level

If you installed Samba from source and didn't specify a prefix during configure, your logs should be located in /usr/local/samba/var/, unless you have specified a log file = directive in your smb.conf. This can be checked by using either testparm -v (for the samba 3.X series) or samba-tool testparm -v (for the samba 4.X series), this will provide a lot of output so you can also add a | grep "log file"

  • Note: If you add grep to the command it will silently prompt you to press enter.

Sometimes the log file will not have the info you need, if so, you can turn up the amount of logging by adding the following line to the [global] section of your smb.conf:

log level = 3

by default samba only logs at level 0, so start low and turn it up slowly, you will need to restart samba after making this change.

Process Management

Making sure samba is running

Use the following command to check if Samba is running:

# ps axf | egrep "samba|smbd|nmbd|winbindd"

The output should look similar to the following:

 1577 ?        Ss     0:00 samba
 1578 ?        S      0:00  \_ samba
 1581 ?        Ss     0:00  |   \_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes --foreground
 1594 ?        S      0:00  |       \_ /usr/local/samba/sbin/smbd -D --option=server role check:inhibit=yes --foreground
 1579 ?        S      0:00  \_ samba
 1580 ?        S      0:00  \_ samba
 1582 ?        S      0:00  \_ samba

"samba" or child processes do not start

Check out the Samba port usage for a Domain Controller documentation and compare it with the output of

# netstat -tulpn | egrep "samba|smbd|nmbd|winbind"

If Samba isn't listening on all the ports it should, check your Samba logs for further debugging.

Samba Internal DNS does not start

The Samba logfile shows

[2014/07/05 22:46:07.334864,  0] ../source4/smbd/service_stream.c:346(stream_setup_socket)

Make sure that no other service is listening on port 53/udp and 53/tcp. Typically this is caused by another DNS server listening on the port e. g. Dnsmasq. Check by using

# netstat -tulpn | grep ":53"

If you are using the Internal DNS, it should only return the "samba" processes bound to this port.


kinit/klist does not exist on your system

See OS Requirements.


DNS Replication from Windows AD DC fails

Steps provided by xdexter. Some users report that their windows AD DC DNS record don't replicate back to Samba DC.

# samba-tool drs showrepl

Will not show DC=ForestDnsZones and DC=DomainDnsZones ON "OUTBOUND NEIGHBORS"

Below are some steps on windows 2003, 2008 might be different.

1. Logon to a Windows domain controller with an Enterprise admin account (Prefer to logon to the replication partner of the problematic DC)

2. Run ntdsutil in a Domain Controller

3. Run "domain management" command in ntdsutil

4. Run "Connections" command and then connect to local server by "Connect to server localdcname" command. (Replace localdcname with local DC's hostname)

5. Hit Q and enter.

6. Run the following command and you will see that your problematic server is not listed in the output, although it should, since it has DNS server installed.

 If you are replicating a DNS zone to the forest then run "List NC Replicas DC=ForestDnsZones,DC=domain,DC=com"
 If you are replicating a DNS zone to the domain then run "List NC Replicas DC=DomainDnsZones,DC=domain,DC=com"
 Before continuing to the next step make sure that there is no object under "LostAndFoundConfig" (serves as a container for lost forestwide objects) container. 
 You can check this with ADSIEDIT.msc under Configuration Partition. If there is an object first check its "lastKnownParent" attribute and if you decide if this is not an orphaned object then move it to its location. 
 If you decide this is an orphaned object then delete it.

7. Now add your problematic Domain Controller with DNS server install to the NC's you are replicating. By running following commands.

8. For Forest wide DNS partition:

  "Add NC Replica DC=ForestDnsZones,DC=domain,DC=com" (problematic DC name must be in full DNS name format). 
  For Domain wide DNS partition:
  "Add NC Replica DC=DomainDnsZones,DC=domain,DC=com" (problematic DC name must be in full DNS name format).

9. Force replication on problematic DC from its partner (where follow the steps from 1 to 8).


Some thoughts on SELinux and discretionary access control permissions that can prevent login using AD users are on the Samba AD DC Access Control Settings page.

Dependencies and Libraries

Installing Python 2.6.5 for Samba

If you encounter issues with your distribution version of Python, you can install Python 2.6.5 from this install script, included with the tarball or git files:

sh /usr/local/samba  --enable-debug --enable-selftest

You will also need to add export PATH=/usr/local/samba/python/bin:/usr/local/samba/bin:/usr/local/samba/sbin:$PATH to the end of your ~/.bashrc file before things will work properly.