[Samba] Unable to "rejoin" existing DC after upgrade (infamous WERR_FILE_NOT_FOUND)

Wed Mar 8 14:38:11 UTC 2023

hi , 
thank's for your reply . 
no , current DC doesn't have that GUID: 

samba-tool spn list zimbra$ 
zimbra$ 
... 
ldap/3ecb2a51-b21d-4bef-84ed-700db7963ff4._msdcs.domain.lan 

samba-tool spn list landc$ 
landc$ 
... 
ldap/5bf8cf1f-1e35-40c6-a20d-0abc88238d92._msdcs.domain.lan 

that GUID is of the machine we are trying to join to: 
samba-tool spn list nextcloud$ 
nextcloud$ 
... 
ldap/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347._msdcs.domain.lan 

is there some other we can look at? 
thank's 

----- Messaggio originale ----- 
Da: "Lorenzo Milesi" <lorenzo.milesi at yetopen.com> 
A: "Fabrizio Rompani" <fabrizio.rompani at yetopen.com> 
Inviato: Mercoledì, 8 marzo 2023 13:33:47 
Oggetto: Fwd: [Samba] Unable to "rejoin" existing DC after upgrade (infamous WERR_FILE_NOT_FOUND) 

----- Forwarded Message ----- 
> From: "Rowland Penny via samba" <samba at lists.samba.org> 
> To: "samba" <samba at lists.samba.org> 
> Cc: "Rowland Penny" <rpenny at samba.org> 
> Sent: Wednesday, March 8, 2023 12:56:09 PM 
> Subject: Re: [Samba] Unable to "rejoin" existing DC after upgrade (infamous WERR_FILE_NOT_FOUND) 

> On 08/03/2023 11:07, Lorenzo Milesi via samba wrote: 
>> Hi. 
>> As happened some weeks ago, here I am again updating an old Samba 4.14.x network 
>> to a current version. The server hosting the FSMO roles is a Debian10 with 
>> 4.14.14, while the third node is a Ubuntu 18 running LinuxSchools build 4.14.8. 
>> 
>> We started from a Ubuntu 20.04 server running Louis builds. We demoted the node 
>> and joined it back to the domain with 4.17.5 from Michael. Although on the node 
>> itself everything seemed ok, the DC didn't appear in DNS, while visible in 
>> Sites and ADUC. 
>> Replication is reported as ALL GOOD on the upgraded node, but the remote ones 
>> are in error with WERR_FILE_NOT_FOUND. 
>> 
>> We enabled drs_repl log on the 4.14.8, pasting below. 
>> It seems failing because it cannot find the DNS records, which it cannot have 
>> because replication is not working. If I run 
>> dig 3fa4ff9a-7fdc-4912-ad73-08b98f6bf347._msdcs.domain.lan @zimbraip 
>> it returns the correct value, while the same command against any of the two 
>> other DCs fails. But maybe this is not the root cause of the problem. 
>> 
>> samba_dnsupdate ran without errors on the 4.17 node, but the other DCs never 
>> received those DNS records. 
>> 
>> What else can we check? 
>> thanks 
>> 
>> 
>> # conf on 4.14.8 
>> [global] 
>> netbios name = ZIMBRA 
>> realm = DOMAIN.LAN 
>> server role = active directory domain controller 
>> workgroup = DOM 
>> server services = -dns 
>> allow dns updates = disabled 
>> interfaces = tun0 lo 
>> log level = 1 drs_repl:10 
>> 
>> [sysvol] 
>> path = /var/lib/samba/sysvol 
>> read only = No 
>> 
>> [netlogon] 
>> path = /var/lib/samba/sysvol/domain.lan/scripts 
>> read only = No 
>> 
>> # conf on newly upgraded 4.17.5 
>> [global] 
>> interfaces = tun0 lo 
>> netbios name = NEXTCLOUD 
>> realm = DOMAIN.LAN 
>> server role = active directory domain controller 
>> workgroup = DOM 
>> 
>> log level = 1 drs_repl:10 
>> [sysvol] 
>> path = /var/lib/samba/sysvol 
>> read only = No 
>> 
>> [netlogon] 
>> path = /var/lib/samba/sysvol/domain.lan/scripts 
>> read only = No 
>> 
>> # log excerpt from 4.14.8 - zimbra node 
>> [2023/03/08 11:53:48.764405, 10, pid=4709, effective(0, 0), real(0, 0), 
>> class=drs_repl] 
>> ../../source4/dsdb/repl/drepl_notify.c:391(dreplsrv_notify_check) 
>> dreplsrv_notify_check: queued DsReplicaSync for DC=domain,DC=lan to 
>> 3fa4ff9a-7fdc-4912-ad73-08b98f6bf347._msdcs.domain.lan (urgent=true) 
>> uSN=0:27662 
> 
> It looks like it is trying to replicate to the GUID representation of a 
> DC, if you check the DC objects you should find SPN's like this: 
> 
> servicePrincipalName: 
> ldap/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347._msdcs.domain.lan 
> 
> Each DC should have a similar SPN, but with a different GUID and the 
> GUID will probably be a part of other SPN's in each DC object. 
> 
> Do any of your current DC's use that GUID 
> (3fa4ff9a-7fdc-4912-ad73-08b98f6bf347) ? 
> 
> Rowland 
> 
> 
> -- 
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> instructions: https://lists.samba.org/mailman/options/samba 

-- 
Lorenzo Milesi - lorenzo.milesi at yetopen.com 
CTO @ YetOpen Srl 

Corso Martiri della Liberazione 114 - 23900 Lecco - ITALY - | 4801 Glenwood Avenue - Suite 200 - Raleigh, NC 27612 - USA - 
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Nel caso in cui questo messaggio Le fosse pervenuto per errore, La invitiamo ad eliminarlo senza copiarlo, stamparlo, a non inoltrarlo a terzi e ad avvertirci non appena possibile.

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pursuant to Legislative Decree 196/2003 and the European General Data Protection Regulation 679/2016 - GDPR - any unauthorized review, use, disclosure or distribution

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