[Samba] Samba AD - "No logon servers available"

Bruno Miguel Martins bruno.miguel.martins at iten.pt
Mon Jan 2 10:19:34 UTC 2017

Hello Marc,

Yeah, only Windows DC's left. Customer wanted this way.

I can resolve all those records using nslookup. However, when pointing clients to the new DNS server, they just don't "re-map" to new domain controllers. New client PC's domain join work OK.


-----Original Message-----
From: Marc Muehlfeld [mailto:mmuehlfeld at samba.org] 
Sent: 29 de dezembro de 2016 16:21
To: Bruno Miguel Martins <bruno.miguel.martins at iten.pt>; samba at lists.samba.org
Subject: Re: [Samba] Samba AD - "No logon servers available"

Hello Bruno,

Am 29.12.2016 um 17:01 schrieb Bruno Miguel Martins via samba:
> I've migrated from Samba NT4 to Samba AD, joined other Windows DC's to 
> the domain and then demoted my Samba DC.
> I am not being able to login from client computers with the error 
> stated on the subject. I've tried everything, from making sure 
> replication is OK, client DNS configuration also.
> Registry modifications from prior Samba NT4 domain were reverted in 
> the client.
> Are there any hints on what to do next?

You're only having Windows DCs left?

May I ask why you migrated from Samba AD to Windows?

It sounds like the _ldap DNS record is missing, Windows uses to locate the DC. Can you please verify that all required _ldap/_kerberos records exist in the correct zones. For some examples, see:
or because you are no longer a Samba user: ;-) https://technet.microsoft.com/en-us/library/cc961719.aspx

If all required records exist and logging in still fails, I continue guessing that it is DNS related:
- At least one of the Windows DCs runs a DNS server?
- The clients are using the DNS on the Windows DC?
  Test by running on a client
  > ping Short_DC_Name


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