[Samba] samba 4.7.0 replication errors

thom_schu at gmx.de thom_schu at gmx.de
Fri Sep 29 09:07:07 UTC 2017

we have 5 ADDCs. All of them did run with sernet-samba 4.6.7.
I updated 4 of them to sernet-samba 4.7.0, one after the other, checked replication, everything seemed to be ok.
One day later a colleague wanted to delete a lot of users with a powershell-script and since then the
replication doesnt work anymore. (Im sure the script is not the problem, but it seemes like it triggered something)

All samba-servers with version 4.7.0 report errors with at least one other ADDC like 

 Default-First-Site-Name\ISAMBA4-2 via RPC
   DSA object GUID: 5dc32731-e914-486d-96f1-ce065ff956bf
   Last attempt @ Fri Sep 29 10:37:24 2017 CEST failed, result 58 (WERR_BAD_NET_RESP)
   358 consecutive failure(s).
   Last success @ Thu Sep 28 10:18:16 2017 CEST

The command "samba-tool dbcheck --cross-ncs --fix --yes" reports hundreds of errors like

   ERROR: orphaned backlink attribute 'memberOf' ...

The dbcheck-command says, it fixed the problems, but when I execute again, a lot of the same error comes again ( I can not say, if the same entries are effected).

The log.samba has a lot of entries like
   [2017/09/29 10:26:15.502219,  0] ../source4/dsdb/repl/drepl_out_helpers.c:959(dreplsrv_op_pull_source_apply_changes_trigger)

If I make the dbcheck on the last server with version 4.6.7, this errors dont appear.

How do I get the replication to work again ?

Is the error "orphaned backlink attribute" the reason, why replication doesnt work anymore ?
And if so, do I have to fix all groups manually like said in a similar problem from the post "Samba 4.7.0 replication issue: failed get spanning tree edges" ?

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