Problems with Exchange schema extensions

Samuel Cabrero Alamán scabrero at
Wed Feb 6 09:56:07 MST 2013


as part of an R&D project we have been trying to deploy samba4 in a 
relatively complex AD domain with trust relationships and Exchange 
schema extensions.

Samba joins without problems to the domain, and as expected trust 
relationships were not working. The users from the external domain could 
not be authenticated. As a workaround, we tried to remove from DNS the 
kerberos SRV records and after that all users from trusted domain could 

The problem is that after some time, samba goes to 100% CPU and some RPC 
related errors began to appear while adding groups to a user account saying:

* The RPC server is unavailable.
   Facility: Win32
   ID no: c000706ba
   Microsoft Active Directory - Exchange Extension

* The program cannot open the required dialog box because it cannot 
determine whether the computer named "vm-dc-4.<domain>" is joined to domain.

I have attached a level 10 log. Any clues where the problem could be?

Best regards.

Samuel Cabrero - Developer
scabrero at <mailto:scabrero at>

The Linux small business server <>
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