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Fabrizio Rompani

2023-Mar-08 17:09 UTC

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

----- Messaggio originale -----
Da: "Rowland Penny via samba" <samba at lists.samba.org>
A: "samba" <samba at lists.samba.org>
Cc: "Rowland Penny" <rpenny at samba.org>
Inviato: Mercoled?, 8 marzo 2023 17:01:34
Oggetto: Re: [Samba] Unable to "rejoin" existing DC after upgrade
(infamous WERR_FILE_NOT_FOUND)

Please do not 'cc' me or reply to 'all', just reply to the list

sure, sorry !

On 08/03/2023 15:20, Fabrizio Rompani wrote:> 
> 
> ----- Messaggio originale -----
> Da: "Rowland Penny via samba" <samba at lists.samba.org>
> A: "samba" <samba at lists.samba.org>
> Cc: "Rowland Penny" <rpenny at samba.org>
> Inviato: Mercoled?, 8 marzo 2023 16:05:30
> Oggetto: Re: [Samba] Unable to "rejoin" existing DC after upgrade
(infamous WERR_FILE_NOT_FOUND)
> 
> On 08/03/2023 14:38, Fabrizio Rompani via samba wrote:
>> 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
>>
> 
> I might be misunderstanding something here, but it sounds like you are
> trying to join a running DC to a running domain
> 
> Forget you have three 'potential' DC's for a moment, the way to
join a
> new DC goes like this:
> 
> You have a fully working DC, lets call it DC1
> You now want to add another DC, lets call this DC2
> 
> You go to DC2 (which it this point isn't a DC), you configure it to use
> DC1 as its name server, you remove the smb.conf and stop any running
> Samba daemons. You then run the command to join as a DC:
> samba-tool domain join domain.lan DC ...................
> 
> This should then replicate most of the AD records from an existing AD DC
> to what is becoming your new DC (the rest are created when the new DC is
> started or shortly after)
> 
> Is this basically what you are doing ?
> 
> 
> Yes, that's exactly what we 're doing.
> more precisly:
> previously we have dc2 joined as DC and all fully functioning .
> we have  demoted and  removed samba .
> than upgraded from 4.14 to samba 4.17
> and finally triyng to re-join as you described : remove smb.conf , stop
samba , samba-tool domain join domain.lan DC .
> at this stage , on the new dc node seems everything ok: ALL GOOD
> but the remote ones are in error with WERR_FILE_NOT_FOUND.
So, these errors are occurring after the join has completed, what, if 
anything, are you doing to trigger them ?

yes , after join completed . 
error is trigged  with the command : 

root at landc:~# samba-tool drs showrepl --summary
There are failing connections        
Failing outbound connections:                    
CN=Configuration,DC=domain,DC=lan
        Default-First-Site-Name\NEXTCLOUD via RPC
                DSA object GUID: 3fa4ff9a-7fdc-4912-ad73-08b98f6bf347
                Last attempt @ Wed Mar  8 17:30:23 2023 CET failed, result 2
(WERR_FILE_NOT_FOUND)
                4 consecutive failure(s).
                Last success @ NTTIME(0)
                                                 
DC=ForestDnsZones,DC=domain,DC=lan
        Default-First-Site-Name\NEXTCLOUD via RPC
                DSA object GUID: 3fa4ff9a-7fdc-4912-ad73-08b98f6bf347
                Last attempt @ Wed Mar  8 17:30:23 2023 CET failed, result 2
(WERR_FILE_NOT_FOUND)
                4 consecutive failure(s).
                Last success @ NTTIME(0)



Can you ping the other two DC's from each DC ?
yes 

Please define 'remote'.
there is one DC in lan , and 2 "remote" DC's in cloud connected
via VPN .

Is each DC using its own ipaddress as its first nameserver in 
/etc/resolv.conf ?

yes but one of them has 127.0.0.1  can make any difference ? 


Have you checked replication with:
  samba-tool drs relication
yes, OK

Have you checked each DC's database with:
   samba-tool dbcheck
yes, OK


have you tried to replicate from the DC that holds the PDC_Emulator FSMO 
role to the other two
yes 

Have you checked replication with:
  samba-tool ldapcmp

there' s error: 

samba-tool  ldapcmp ldap://landc ldap://nextcloud domain -U administrator

* Comparing [DOMAIN] context...

* Objects to be compared: 309

Comparing:
'CN=NEXTCLOUD,OU=DOMAIN CONTROLLERS,DC=DOMAIN,DC=LAN' [ldap://landc]
'CN=NEXTCLOUD,OU=DOMAIN CONTROLLERS,DC=DOMAIN,DC=LAN' [ldap://nextcloud]
    Difference in attribute values:
        servicePrincipalName => 
[b'E3514235-4B06-11D1-AB04-00C04FC2DCD2/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347/domain.lan',
b'GC/nextcloud.domain.lan/domain.lan', b'HOST/NEXTCLOUD',
b'HOST/nextcloud.domain.lan']
[b'E3514235-4B06-11D1-AB04-00C04FC2DCD2/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347/domain.lan',
b'GC/nextcloud.domain.lan/domain.lan', b'HOST/NEXTCLOUD',
b'HOST/nextcloud.domain.lan',
b'HOST/nextcloud.domain.lan/WORKGROUP',
b'HOST/nextcloud.domain.lan/domain.lan',
b'RestrictedKrbHost/NEXTCLOUD',
b'RestrictedKrbHost/nextcloud.domain.lan',
b'ldap/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347._msdcs.domain.lan',
b'ldap/NEXTCLOUD', b'ldap/nextcloud.domain.lan',
b'ldap/nextcloud.domain.lan/DomainDnsZones.domain.lan',
b'ldap/nextcloud.domain.lan/WORKGROUP',
b'ldap/nextcloud.domain.lan/ForestDnsZones.domain.lan',
b'ldap/nextcloud.domain.lan/domain.lan']

    FAILED

* Result for [DOMAIN]: FAILURE

SUMMARY
---------

Attributes with different values:

    servicePrincipalName
ERROR: Compare failed: -1




thank's 
rf

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Michael Tokarev

2023-Mar-08 17:20 UTC

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

08.03.2023 20:09, Fabrizio Rompani via samba ?????:
...> root at landc:~# samba-tool drs showrepl --summary
> There are failing connections
> Failing outbound connections:
> CN=Configuration,DC=domain,DC=lan
>          Default-First-Site-Name\NEXTCLOUD via RPC
>                  DSA object GUID: 3fa4ff9a-7fdc-4912-ad73-08b98f6bf347
>                  Last attempt @ Wed Mar  8 17:30:23 2023 CET failed, result
2 (WERR_FILE_NOT_FOUND)
>                  4 consecutive failure(s).
>                  Last success @ NTTIME(0)
That all smells quite similar to what I were seeing
here before, and what someone else were seeing too,
all with 4.17[.4]. This famouse WERR_FILE_NOT_FOUND
error too.

FWIW.

/mjt

Rowland Penny

2023-Mar-08 17:39 UTC

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

On 08/03/2023 17:09, Fabrizio Rompani via samba wrote:
> 
> yes , after join completed .
> error is trigged  with the command :
> 
> root at landc:~# samba-tool drs showrepl --summary
> There are failing connections
> Failing outbound connections:
> CN=Configuration,DC=domain,DC=lan
>          Default-First-Site-Name\NEXTCLOUD via RPC
>                  DSA object GUID: 3fa4ff9a-7fdc-4912-ad73-08b98f6bf347
>                  Last attempt @ Wed Mar  8 17:30:23 2023 CET failed, result
2 (WERR_FILE_NOT_FOUND)
>                  4 consecutive failure(s).
>                  Last success @ NTTIME(0)
>                                                   
> DC=ForestDnsZones,DC=domain,DC=lan
>          Default-First-Site-Name\NEXTCLOUD via RPC
>                  DSA object GUID: 3fa4ff9a-7fdc-4912-ad73-08b98f6bf347
>                  Last attempt @ Wed Mar  8 17:30:23 2023 CET failed, result
2 (WERR_FILE_NOT_FOUND)
>                  4 consecutive failure(s).
>                  Last success @ NTTIME(0)
> 
> 
> 
> Is each DC using its own ipaddress as its first nameserver in
> /etc/resolv.conf ?
> 
> yes but one of them has 127.0.0.1  can make any difference ?
There have been problems in the past when '127.0.0.1' has been used, I 
don't think it will help much, but I would change it to the DC's 
ipaddress, you never know your luck.
> 
> 
> Have you checked replication with:
>    samba-tool drs relication
> yes, OK
> 
> Have you checked each DC's database with:
>     samba-tool dbcheck
> yes, OK
> 
> 
> have you tried to replicate from the DC that holds the PDC_Emulator FSMO
> role to the other two
> yes
> 
> Have you checked replication with:
>    samba-tool ldapcmp
> 
> there' s error:
> 
> samba-tool  ldapcmp ldap://landc ldap://nextcloud domain -U administrator
> 
> * Comparing [DOMAIN] context...
> 
> * Objects to be compared: 309
> 
> Comparing:
> 'CN=NEXTCLOUD,OU=DOMAIN CONTROLLERS,DC=DOMAIN,DC=LAN'
[ldap://landc]
> 'CN=NEXTCLOUD,OU=DOMAIN CONTROLLERS,DC=DOMAIN,DC=LAN'
[ldap://nextcloud]
>      Difference in attribute values:
>          servicePrincipalName =>
>
[b'E3514235-4B06-11D1-AB04-00C04FC2DCD2/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347/domain.lan',
b'GC/nextcloud.domain.lan/domain.lan', b'HOST/NEXTCLOUD',
b'HOST/nextcloud.domain.lan']
>
[b'E3514235-4B06-11D1-AB04-00C04FC2DCD2/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347/domain.lan',
b'GC/nextcloud.domain.lan/domain.lan', b'HOST/NEXTCLOUD',
b'HOST/nextcloud.domain.lan',
b'HOST/nextcloud.domain.lan/WORKGROUP',
b'HOST/nextcloud.domain.lan/domain.lan',
b'RestrictedKrbHost/NEXTCLOUD',
b'RestrictedKrbHost/nextcloud.domain.lan',
b'ldap/3fa4ff9a-7fdc-4912-ad73-08b98f6bf347._msdcs.domain.lan',
b'ldap/NEXTCLOUD', b'ldap/nextcloud.domain.lan',
b'ldap/nextcloud.domain.lan/DomainDnsZones.domain.lan',
b'ldap/nextcloud.domain.lan/WORKGROUP',
b'ldap/nextcloud.domain.lan/ForestDnsZones.domain.lan',
b'ldap/nextcloud.domain.lan/domain.lan']
> 
>      FAILED
> 
> * Result for [DOMAIN]: FAILURE
> 
> SUMMARY
> ---------
> 
> Attributes with different values:
> 
>      servicePrincipalName
> ERROR: Compare failed: -1
You have a serious problem there, there are 4 SPN's on landc and 15 on 
the other, there seems to something going wrong and, at the moment, it 
is escaping me.
You could try a forced sync from nextcloud with 'samba-tool drs 
replicate' using the '--sync-forced' switch

Rowland

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