[Samba] RPC Server Unavailable - Error

Rowland penny rpenny at samba.org
Mon Jun 17 15:05:59 UTC 2019

On 17/06/2019 15:44, Anantha Raghava via samba wrote:
> Hi,
> We were running Samba-AD - Version 4.7.6 for over 2 years without any 
> errors. We have 4 Domain Controllers in our setup and DNS is BIND_DLZ 
> (BIND 9.9.4). Off late (since 8th June 2019) we upgraded the Samba-AD 
> version to 4.10.4 and all of sudden we started receiving the error 
> "RPC Server not available" when we are trying to join the new PCs to 
> domain. After multiple attempts the PC gets added to domain. We 
> restart samba server on the log on server, the error goes off. There 
> is no specific pattern for this appear to appear.
> We are receiving the same error whenever we are trying to add a new 
> user or modify a user attribute in RSAT. When this error comes, we 
> have to restart the RSAT server multiple times to start functioning 
> again.
> Is there is any specific reason for this error? How do we fix it.

Did you upgrade directly from 4.7.6 to 4.10.4 ?

If so, it looks like a known bug isn't fixed, a new GUID index mode was 
introduced at 4.8.0 and if you bypassed the 4.8 versions, the later 
versions of Samba act as if it was now being used, but as it isn't, you 
get problems like this. The bug is supposed to be fixed, but it may not 
be for you. You will need to down grade to 4.7.6 again and then upgrade 
to 4.8.x before upgrading to 4.10.4 again.


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