[Samba] DomainDnsZones inbound replication issue

[lingpanda101 at gmail.com]

On 7/28/2016 9:24 AM, Donaldson Jeff wrote:
> Greetings,
>
>
> I am having a problem with one of my DCs (DC3) replicating DomainDnsZones. On DC3 replication is successful on both Inbound and Outbound with both of my other DCs. On both of my other DCs (DC1 & DC2) I only get a failure with Inbound replication for DomainDnsZones from DC3 with a result 8442 (WERR_DS_DRA_INTERNAL_ERROR).
>
>
> If I try to force replication to DC3 from DC1 using samba-tool drs replicate DC3 DC1 DC=DomainDnsZones,DC=our,DC=domain,DC=com --full-sync, I get the following:
>
>
> ldb_wrap open of secrets.ldb
> GENSEC backend 'gssapi_spnego' registered
> GENSEC backend 'gssapi_krb5' registered
> GENSEC backend 'gssapi_krb5_sasl' registered
> GENSEC backend 'spnego' registered
> GENSEC backend 'schannel' registered
> GENSEC backend 'naclrpc_as_system' registered
> GENSEC backend 'sasl-EXTERNAL' registered
> GENSEC backend 'ntlmssp' registered
> GENSEC backend 'http_basic' registered
> GENSEC backend 'http_ntlm' registered
> GENSEC backend 'krb5' registered
> GENSEC backend 'fake_gssapi_krb5' registered
> Using binding ncacn_ip_tcp:ncsauth3[,seal]
> resolve_lmhosts: Attempting lmhosts lookup for name ncsauth3<0x20>
> resolve_lmhosts: Attempting lmhosts lookup for name ncsauth3<0x20>
> resolve_lmhosts: Attempting lmhosts lookup for name ncsauth3<0x20>
> Failed to bind - LDAP error 8 LDAP_STRONG_AUTH_REQUIRED -  <SASL:[GSS-SPNEGO]: Sign or Seal are required.> <>
> Failed to connect to 'ldap://ncsauth3' with backend 'ldap': (null)
> ERROR(ldb): LDAP connection to ncsauth3 failed - None
>    File "/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/drs.py", line 48, in samdb_connect
>      credentials=ctx.creds, lp=ctx.lp)
>    File "/usr/local/samba/lib/python2.7/site-packages/samba/samdb.py", line 56, in __init__
>      options=options)
>    File "/usr/local/samba/lib/python2.7/site-packages/samba/__init__.py", line 114, in __init__
>      self.connect(url, flags, options)
>    File "/usr/local/samba/lib/python2.7/site-packages/samba/samdb.py", line 71, in connect
>      options=options)
>
>
> I didn't have any replication issues prior to upgrading Samba to 4.4.4 and the server to Ubuntu 14.04.4. After upgrading I ran samba-tool dbcheck --cross-ncs --fix. Not sure how to proceed to resolve the issue. Would the best solution be to demote the affected DC, wipe out all of private, then join as a DC again? Any help or suggestions are greatly appreciated.
>
> Regards,
> Jeff
>
> Jeff Donaldson
> Technology Director
> Newark Charter School
> jeff.donaldson at ncs.k12.de.us
> (302) 369-2001 ext: 625

What is the value of

"ldap server require strong auth =" in your smb.conf? You may need to 
run 'samba-tool testparm -v'

-- 
-James