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2017-Oct-09 17:28 UTC

[Samba] samba getting stuck, highwatermark replication issue?

Hi all,

We would appreciate some input here. Not sure where to look...

We have three AD DCs, all running samba 4.5.10, and since a few days, 
the samba DCs are getting stuck regularly, at ramdon times. Happens to 
all three of them, randomly, and currently it is happening up to a few 
times per day..! Must be some common cause.

For the rest, the systems appear fine, enough diskspace, nothing special 
in syslog, etc.

We usually detect that a DC has become stuck, because LDAP auth no 
longer works in that DC. Checking with "service sernet-samba-ad
status"
will still report "Running".

After shutting down samba ("service sernet-samba-ad stop") one process
usually is still running, and prevents a restart from succeeding, always 
because:
> Failed to listen on 0.0.0.0:135 - NT_STATUS_ADDRESS_ALREADY_ASSOCIATED
ps aux tells me that the process is: "samba -D"

Killing that process makes samba startup succeed, replication work 
again, and samba funcion, until the next time this happens.

But WHY is samba getting stuck in the first place?

We are getting the following unusual in the logs on all three
DCs:>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 2nd
replication on DN DC=samba,DC=company,DC=com older highwatermark (last_dn
CN=a_username,CN=Users,DC=samba,DC=company,DC=com)
>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 2nd
replication on DN DC=samba,DC=company,DC=com older highwatermark (last_dn
CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)
>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 2nd
replication on DN DC=samba,DC=company,DC=com older highwatermark (last_dn
CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)and the last line keeps repeating 2 - 3 times per second, completely 
filling up the logs. The start-off username  differs per DC, but on each 
DC it usually remains the same. (I have seen 5 or 6 different usernames 
in total)

samba-tool dbcheck --cross-ncs looks similar on all three DCs, with 
*many* errors about unsorted attributes, that I think I've been told in 
the past are harmless:> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x0002000d
> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00020002
> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00020001
> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x0000000d
> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00000003
> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00000000
> ERROR: unsorted attributeID values in replPropertyMetaData on
CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com
> 
> Not fixing replPropertyMetaData on
CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com
> 
> Please use --fix to fix these errors
> Checked 4948 objects (4193 errors)
All 4948 errors are about unsorted attributeID, with the following 
exception: There appear still some references to an old (many YEARS ago 
removed) DC:> ERROR: no target object found for GUID component for
msDS-NC-Replica-Locations in object
CN=84bea0a7-82dd-4237-9296-030573700698,CN=Partitions,CN=Configuration,DC=samba,DC=company,DC=com
-
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=187541>;<RMD_ORIGINATING_USN=3630>;<RMD_VERSION=0>;CN=NTDS
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
> ERROR: no target object found for GUID component for
msDS-NC-Replica-Locations in object
CN=d9d76e21-8cae-457d-b212-6cb192612739,CN=Partitions,CN=Configuration,DC=samba,DC=company,DC=com
-
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=187515>;<RMD_ORIGINATING_USN=3631>;<RMD_VERSION=0>;CN=NTDS
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
That's about all info I can gather.

The very basic smb.conf on the DCs::
> [global]
> 	workgroup = WRKGRP
> 	realm = samba.company.com
> 	netbios name = DC4
> 	server role = active directory domain controller
> 	log level = 3
> 	dns forwarder = 192.x.x.x
> 	server signing = mandatory
> 	ntlm auth = yes
> 	ldap server require strong auth = no
> 	idmap_ldb:use rfc2307 = yes
> 
> [netlogon]
> 	path = /var/lib/samba/sysvol/samba.company.com/scripts
> 	read only = No
> 
> [sysvol]
> 	path = /var/lib/samba/sysvol
> 	read only = No
> 	acl_xattr:ignore system acls = yes
We have been running 4.5.10 since may 2017, and this issue started this 
week.

Anyone with an idea?

lists

2017-Oct-09 18:32 UTC

head link

[Samba] samba getting stuck, highwatermark replication issue?

A bit more info:

We are currently getting those errors on DC2:> ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 2nd
replication on DN DC=samba,DC=company,DC=com older highwatermark (last_dn
CN=a_username,CN=Users,DC=samba,DC=company,DC=com)
> ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 2nd
replication on DN DC=samba,DC=company,DC=com older highwatermark (last_dn
CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)
> ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 2nd
replication on DN DC=samba,DC=company,DC=com older highwatermark (last_dn
CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)
and they are also causing very high cpu usage on that DC. (85 - 90%)
On the other DCs, cpu usage is normal.

Replication still going strong, so DC2 is buzy, but functional.

The pid with high cpu usage is 3155, processlist:
> root at DC2:/var/log/samba# ps aux
> USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
> root         1  0.0  0.0  10656   800 ?        Ss   17:22   0:00 init [2]
....> root      1732  0.0  0.0  25304   420 ?        Ss   17:22   0:00
/usr/sbin/rpc.idmapd
> root      3153  0.0  0.5 553028 45272 ?        Ss   17:49   0:00
/usr/sbin/samba -D
> root      3154  0.0  0.3 553028 32644 ?        S    17:49   0:00
/usr/sbin/samba -D
> root      3155 85.5  0.7 561376 60052 ?        R    17:49 134:29
/usr/sbin/samba -D
> root      3156  0.0  0.6 541756 49448 ?        Ss   17:49   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> root      3157  0.0  0.4 557180 35124 ?        S    17:49   0:00
/usr/sbin/samba -D
> root      3158  0.0  0.3 553028 32636 ?        S    17:49   0:00
/usr/sbin/samba -D
> root      3159  3.3  0.8 554536 70464 ?        S    17:49   5:16
/usr/sbin/samba -D
> root      3160  0.1  0.4 553028 34016 ?        S    17:49   0:10
/usr/sbin/samba -D
> root      3161  0.3  0.4 557180 36440 ?        S    17:49   0:31
/usr/sbin/samba -D
> root      3162  0.1  0.4 568024 37800 ?        S    17:49   0:09
/usr/sbin/samba -D
> root      3163  0.0  0.3 553028 32636 ?        S    17:49   0:00
/usr/sbin/samba -D
> root      3164  0.0  0.4 553028 33752 ?        S    17:49   0:00
/usr/sbin/samba -D
> root      3165  0.0  0.7 557180 60000 ?        S    17:49   0:00
/usr/sbin/samba -D
> root      3166  0.0  0.4 553028 33588 ?        S    17:49   0:00
/usr/sbin/samba -D
> root      3167  0.0  0.4 553548 35232 ?        S    17:49   0:08
/usr/sbin/samba -D
> root      3170  0.0  0.5 484364 46824 ?        Ss   17:49   0:00
/usr/sbin/winbindd -D --option=server role check:inhibit=yes --foreground
> root      3171  0.0  0.3 530724 32708 ?        S    17:49   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> root      3172  0.0  0.4 530740 32828 ?        S    17:49   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> root      3174  0.0  0.4 541748 34048 ?        S    17:49   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> root      3175  0.0  0.4 489260 35340 ?        S    17:49   0:00
/usr/sbin/winbindd -D --option=server role check:inhibit=yes --foreground
> root      3195  0.0  0.4 484364 34448 ?        S    17:49   0:00
/usr/sbin/winbindd -D --option=server role check:inhibit=yes --foreground
> root      3262  0.0  0.4 550092 38520 ?        S    17:52   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> root      3856  0.0  0.4 550092 38592 ?        S    18:38   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> root      4821  0.0  0.4 550116 38716 ?        S    20:06   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> 1464      4976  0.0  0.4 550116 38720 ?        S    20:20   0:00
/usr/sbin/smbd -D --option=server role check:inhibit=yes --foreground
> root      5033  0.0  0.0  25216  1336 pts/0    R+   20:26   0:00 ps aux
Suggestions?

lingpanda101

2017-Oct-09 18:52 UTC

head link

[Samba] samba getting stuck, highwatermark replication issue?

On 10/9/2017 1:28 PM, mj via samba wrote:> Hi all,
>
> We would appreciate some input here. Not sure where to look...
>
> We have three AD DCs, all running samba 4.5.10, and since a few days, 
> the samba DCs are getting stuck regularly, at ramdon times. Happens to 
> all three of them, randomly, and currently it is happening up to a few 
> times per day..! Must be some common cause.
>
> For the rest, the systems appear fine, enough diskspace, nothing 
> special in syslog, etc.
>
> We usually detect that a DC has become stuck, because LDAP auth no 
> longer works in that DC. Checking with "service sernet-samba-ad 
> status" will still report "Running".
>
> After shutting down samba ("service sernet-samba-ad stop") one
process
> usually is still running, and prevents a restart from succeeding, 
> always because:
>
>> Failed to listen on 0.0.0.0:135 - NT_STATUS_ADDRESS_ALREADY_ASSOCIATED
>
> ps aux tells me that the process is: "samba -D"
>
> Killing that process makes samba startup succeed, replication work 
> again, and samba funcion, until the next time this happens.
>
> But WHY is samba getting stuck in the first place?
>
> We are getting the following unusual in the logs on all three DCs:
>> ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 2nd 
>> replication on DN DC=samba,DC=company,DC=com older highwatermark 
>> (last_dn CN=a_username,CN=Users,DC=samba,DC=company,DC=com)
>>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 
>> 2nd replication on DN DC=samba,DC=company,DC=com older highwatermark 
>> (last_dn CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)
>>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 
>> 2nd replication on DN DC=samba,DC=company,DC=com older highwatermark 
>> (last_dn CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)
> and the last line keeps repeating 2 - 3 times per second, completely 
> filling up the logs. The start-off username  differs per DC, but on 
> each DC it usually remains the same. (I have seen 5 or 6 different 
> usernames in total)
>
> samba-tool dbcheck --cross-ncs looks similar on all three DCs, with 
> *many* errors about unsorted attributes, that I think I've been told 
> in the past are harmless:
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x0002000d
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00020002
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00020001
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x0000000d
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00000003
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00000000
>> ERROR: unsorted attributeID values in replPropertyMetaData on 
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com
>>
>> Not fixing replPropertyMetaData on 
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com
>>
>> Please use --fix to fix these errors
>> Checked 4948 objects (4193 errors)
>
> All 4948 errors are about unsorted attributeID, with the following 
> exception: There appear still some references to an old (many YEARS 
> ago removed) DC:
>> ERROR: no target object found for GUID component for 
>> msDS-NC-Replica-Locations in object 
>>
CN=84bea0a7-82dd-4237-9296-030573700698,CN=Partitions,CN=Configuration,DC=samba,DC=company,DC=com
>> - 
>>
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=187541>;<RMD_ORIGINATING_USN=3630>;<RMD_VERSION=0>;CN=NTDS
>>
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
>>
>> ERROR: no target object found for GUID component for 
>> msDS-NC-Replica-Locations in object 
>>
CN=d9d76e21-8cae-457d-b212-6cb192612739,CN=Partitions,CN=Configuration,DC=samba,DC=company,DC=com
>> - 
>>
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=187515>;<RMD_ORIGINATING_USN=3631>;<RMD_VERSION=0>;CN=NTDS
>>
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
>>
>
> That's about all info I can gather.
>
> The very basic smb.conf on the DCs::
>
>> [global]
>>     workgroup = WRKGRP
>>     realm = samba.company.com
>>     netbios name = DC4
>>     server role = active directory domain controller
>>     log level = 3
>>     dns forwarder = 192.x.x.x
>>     server signing = mandatory
>>     ntlm auth = yes
>>     ldap server require strong auth = no
>>     idmap_ldb:use rfc2307 = yes
>>
>> [netlogon]
>>     path = /var/lib/samba/sysvol/samba.company.com/scripts
>>     read only = No
>>
>> [sysvol]
>>     path = /var/lib/samba/sysvol
>>     read only = No
>>     acl_xattr:ignore system acls = yes
>
> We have been running 4.5.10 since may 2017, and this issue started 
> this week.
>
> Anyone with an idea?
>You should be able to fix the 'replPropertyMetaData' errors with;

samba-tool dbcheck --cross-ncs --fix --yes
'fix_replmetadata_unsorted_attid'

The highwatermark doesn't necessarily reflect an issue. It's part of how
the destination DC keeps track of changes from the source DC. Can you 
verify the time and date is correct on all DC's?

The GUID errors seem related to your old DC offline and NTDS connections 
still lingering.  Open Microsoft Sites and Services and remove the ones 
no longer needed.



-- 
--
James

2017-Oct-10 07:14 UTC

head link

[Samba] samba getting stuck, highwatermark replication issue?

Hi James,

Thanks for the quick reply.

On 10/09/2017 08:52 PM, lingpanda101 via samba wrote:
> You should be able to fix the 'replPropertyMetaData' errors with;
> 
> samba-tool dbcheck --cross-ncs --fix --yes 
> 'fix_replmetadata_unsorted_attid'Yep, worked great! Fixed all of those replPropertyMetaData errors! :-)
> The highwatermark doesn't necessarily reflect an issue. It's part
of how
> the destination DC keeps track of changes from the source DC. Can you 
> verify the time and date is correct on all DC's?Date & time matches. But the fact that the same identical message is 
logged multiple times per second, without an end seems a bit strange... 
Combined with high cpu usage on the DC where this happens. (yesterday 
DC2, currently on DC4)
> The GUID errors seem related to your old DC offline and NTDS connections 
> still lingering.  Open Microsoft Sites and Services and remove the ones 
> no longer needed.There is no DC1 mentioned anywhere there. And the two errors remain:
> ERROR: no target object found for GUID component for
msDS-NC-Replica-Locations in object
CN=84bea0a7-82dd-4237-9296-030573700698,CN=Partitions,CN=Configuration,DC=samba,DC=merit,DC=unu,DC=edu
-
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=4605>;<RMD_ORIGINATING_USN=3630>;<RMD_VERSION=0>;CN=NTDS
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=merit,DC=unu,DC=edu
> Not removing dangling forward link
> ERROR: no target object found for GUID component for
msDS-NC-Replica-Locations in object
CN=d9d76e21-8cae-457d-b212-6cb192612739,CN=Partitions,CN=Configuration,DC=samba,DC=merit,DC=unu,DC=edu
-
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=4579>;<RMD_ORIGINATING_USN=3631>;<RMD_VERSION=0>;CN=NTDS
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=merit,DC=unu,DC=edu
> Not removing dangling forward link
I was asked a question during the samba-tool dbcheck:
> Add yourself to the replica locations for
DC=DomainDnsZones,DC=samba,DC=company,DC=com? [y/N/all/none] N
> Not fixing missing/incorrect attributes on
DC=DomainDnsZones,DC=samba,DC=company,DC=com
> 
> Add yourself to the replica locations for
DC=ForestDnsZones,DC=samba,DC=company,DC=com? [y/N/all/none] N
> Not fixing missing/incorrect attributes on
DC=ForestDnsZones,DC=samba,DC=company,DC=com
Should I answer Yes to those two questions?

MJ

2017-Oct-28 09:22 UTC

head link

[Samba] samba getting stuck, highwatermark replication issue?

Hi all,

For the archives I'd like to update this thread with our latest 
findings, the fix for both the high cpu usage and the highwatermark errors!

We had been testing in the past the Microsoft Azure Connect, to import 
our active directory accounts/groups/passwords into the Azure Cloud, in 
order to test microsoft office 365 functionality.

The required tool "Microsoft Azure AD Sync" is what caused our
problems!
We disabled it, and poof, no more high cpu usage, no more highwatermark 
errors.

Hope this info helps someone else, someday :-)

MJ

On 10/09/2017 07:28 PM, mj via samba wrote:> Hi all,
> 
> We would appreciate some input here. Not sure where to look...
> 
> We have three AD DCs, all running samba 4.5.10, and since a few days, 
> the samba DCs are getting stuck regularly, at ramdon times. Happens to 
> all three of them, randomly, and currently it is happening up to a few 
> times per day..! Must be some common cause.
> 
> For the rest, the systems appear fine, enough diskspace, nothing special 
> in syslog, etc.
> 
> We usually detect that a DC has become stuck, because LDAP auth no 
> longer works in that DC. Checking with "service sernet-samba-ad
status"
> will still report "Running".
> 
> After shutting down samba ("service sernet-samba-ad stop") one
process
> usually is still running, and prevents a restart from succeeding, always 
> because:
> 
>> Failed to listen on 0.0.0.0:135 - NT_STATUS_ADDRESS_ALREADY_ASSOCIATED
> 
> ps aux tells me that the process is: "samba -D"
> 
> Killing that process makes samba startup succeed, replication work 
> again, and samba funcion, until the next time this happens.
> 
> But WHY is samba getting stuck in the first place?
> 
> We are getting the following unusual in the logs on all three DCs:
>>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 
>> 2nd replication on DN DC=samba,DC=company,DC=com older highwatermark 
>> (last_dn CN=a_username,CN=Users,DC=samba,DC=company,DC=com)
>>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 
>> 2nd replication on DN DC=samba,DC=company,DC=com older highwatermark 
>> (last_dn CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)
>>   ../source4/rpc_server/drsuapi/getncchanges.c:1961: DsGetNCChanges 
>> 2nd replication on DN DC=samba,DC=company,DC=com older highwatermark 
>> (last_dn CN=Schema Admins,CN=Users,DC=samba,DC=company,DC=com)
> and the last line keeps repeating 2 - 3 times per second, completely 
> filling up the logs. The start-off username  differs per DC, but on each 
> DC it usually remains the same. (I have seen 5 or 6 different usernames 
> in total)
> 
> samba-tool dbcheck --cross-ncs looks similar on all three DCs, with 
> *many* errors about unsorted attributes, that I think I've been told in
> the past are harmless:
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x0002000d
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00020002
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00020001
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x0000000d
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00000003
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com: 0x00000000
>> ERROR: unsorted attributeID values in replPropertyMetaData on 
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com
>>
>> Not fixing replPropertyMetaData on 
>> CN=ykqr002614,CN=Computers,DC=samba,DC=company,DC=com
>>
>> Please use --fix to fix these errors
>> Checked 4948 objects (4193 errors)
> 
> All 4948 errors are about unsorted attributeID, with the following 
> exception: There appear still some references to an old (many YEARS ago 
> removed) DC:
>> ERROR: no target object found for GUID component for 
>> msDS-NC-Replica-Locations in object 
>>
CN=84bea0a7-82dd-4237-9296-030573700698,CN=Partitions,CN=Configuration,DC=samba,DC=company,DC=com
>> - 
>>
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=187541>;<RMD_ORIGINATING_USN=3630>;<RMD_VERSION=0>;CN=NTDS
>>
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
>>
>> ERROR: no target object found for GUID component for 
>> msDS-NC-Replica-Locations in object 
>>
CN=d9d76e21-8cae-457d-b212-6cb192612739,CN=Partitions,CN=Configuration,DC=samba,DC=company,DC=com
>> - 
>>
<GUID=81a27497-bdfb-4977-9874-675bbfba490f>;<RMD_ADDTIME=130405075610000000>;<RMD_CHANGETIME=130405075610000000>;<RMD_FLAGS=0>;<RMD_INVOCID=556b2cb4-e576-48e2-bb7c-7f62caee84fc>;<RMD_LOCAL_USN=187515>;<RMD_ORIGINATING_USN=3631>;<RMD_VERSION=0>;CN=NTDS
>>
Settings,CN=DC1,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
>>
> 
> That's about all info I can gather.
> 
> The very basic smb.conf on the DCs::
> 
>> [global]
>>     workgroup = WRKGRP
>>     realm = samba.company.com
>>     netbios name = DC4
>>     server role = active directory domain controller
>>     log level = 3
>>     dns forwarder = 192.x.x.x
>>     server signing = mandatory
>>     ntlm auth = yes
>>     ldap server require strong auth = no
>>     idmap_ldb:use rfc2307 = yes
>>
>> [netlogon]
>>     path = /var/lib/samba/sysvol/samba.company.com/scripts
>>     read only = No
>>
>> [sysvol]
>>     path = /var/lib/samba/sysvol
>>     read only = No
>>     acl_xattr:ignore system acls = yes
> 
> We have been running 4.5.10 since may 2017, and this issue started this 
> week.
> 
> Anyone with an idea?
>

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