AD DS or AD LDS responds slowly to complex LDAP query that has a deeply nested filter on a Windows server

Symptoms

Assume that you have a Windows Server 2012 R2, Windows Server 2012, or Windows Server 2008 R2 server that has the Active Directory Domain Services (AD DS) or Active Directory Lightweight Directory Services (AD LDS) server role installed. This server receives a complex LDAP query that has a deeply nested filter. In this situation, the search performed by AD DS or AD LDS is slow.

For instructions to collect the query processing details, refer to the links in the "More Information" section.

When you enable NTDS diagnostics event logging to have the "15 Field Engineering" value set to level 5, you may see events such as the following that report queries as inefficient:


When you run the problematic query by using the STATS control, you may receive a summary that resembles the following:

Elapsed Time: 3641 (ms)
Returned 1 entries of 5223 visited - (0.02%)
Used Filter:

Used Indices:
DNT_index:7470:N

Pages Referenced : 33578
Pages Read From Disk : 534
Pages Pre-read From Disk : 121
Pages Dirtied : 0
Pages Re-Dirtied : 0
Log Records Generated : 0
Log Record Bytes Generated: 0

The query is marked as inefficient based on the relation between objects visited and objects returned. The reason that it visits so many objects is that it does not use the best selection of indices.

Note This issue also occurs on Windows 8.1, Windows 8, and Windows 7 on computers that have the AD LDS server role installed.

Cause

This issue occurs because AD DS or AD LDS does not correctly use the defined indices in the LDAP query filter when it performs the search. Instead, it uses a generic index, such as DNT_INDEX.

Resolution

To resolve this issue in Windows 8.1 or Windows Server 2012 R2, install update rollup 2955164.

To resolve this issue in Windows 8, Windows Server 2012, Windows 7, or Windows Server 2008 R2, install the hotfix that is described in this article.



Important notes:

  • LDAP queries that reference attributes that are not defined in the AD schema may be serviced more slowly by AD DS or AD LDS servers that have the KB 2862304 fix installed or that run Windows Server 2012 R2.

  • Microsoft is aware of this issue, and we are working on an update to KB 2862304. More information will be posted to this article when the updated fix is available.

  • To work around this issue, use one of the following methods, as appropriate:

    • Change the queries to reference existing attributes.

    • Add currently undefined attributes to the AD schema.

    • Direct relevant LDAP queries to AD DS or AD LDS servers that do not have update 2862304 or hotfix 2862304 installed. This includes Windows Server 2012 R2 RTM DCs.

Update information for Windows 8.1 and Windows Server 2012 R2

For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:

2955164 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: May 2014

Hotfix information for Windows 8, Windows Server 2012, Windows 7, and Windows Server 2008 R2

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running one of the following operating systems:

  • Windows 8.1

  • Windows Server 2012 R2

  • Windows 8

  • Windows Server 2012

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2 (SP1)

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 8 and Windows Server 2012 file information notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.2.920 0.20xxx

    Windows 8 and Windows Server 2012

    RTM

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 8 and for Windows Server 2012" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows 8 and Windows Server 2012

File name

File version

File size

Date

Time

Platform

Ntdsctrs.ini

Not applicable

58,614

07-Feb-2013

07:07

Not applicable

Report.ad.xml

Not applicable

25,550

07-Feb-2013

07:09

Not applicable

Rules.ad.xml

Not applicable

8,403

07-Feb-2013

07:07

Not applicable

Ntdsctrs.ini

Not applicable

58,202

07-Feb-2013

05:37

Not applicable

Report.ad.xml

Not applicable

23,914

07-Feb-2013

05:39

Not applicable

Rules.ad.xml

Not applicable

7,524

07-Feb-2013

05:37

Not applicable

Ntdsctrs.ini

Not applicable

61,946

07-Feb-2013

03:24

Not applicable

Report.ad.xml

Not applicable

24,076

07-Feb-2013

03:29

Not applicable

Rules.ad.xml

Not applicable

7,695

07-Feb-2013

03:24

Not applicable

Ntdsctrs.ini

Not applicable

62,836

07-Feb-2013

05:22

Not applicable

Report.ad.xml

Not applicable

28,891

07-Feb-2013

05:26

Not applicable

Rules.ad.xml

Not applicable

11,546

07-Feb-2013

05:22

Not applicable

Ntdsctrs.ini

Not applicable

54,538

07-Feb-2013

03:24

Not applicable

Report.ad.xml

Not applicable

22,929

07-Feb-2013

03:30

Not applicable

Rules.ad.xml

Not applicable

7,255

07-Feb-2013

03:24

Not applicable

Ntdsctrs.ini

Not applicable

61,052

07-Feb-2013

03:24

Not applicable

Report.ad.xml

Not applicable

24,503

07-Feb-2013

03:29

Not applicable

Rules.ad.xml

Not applicable

8,030

07-Feb-2013

03:24

Not applicable

Ntdsctrs.ini

Not applicable

66,980

07-Feb-2013

06:21

Not applicable

Report.ad.xml

Not applicable

23,646

07-Feb-2013

06:23

Not applicable

Rules.ad.xml

Not applicable

7,874

07-Feb-2013

06:21

Not applicable

Ntdsctrs.ini

Not applicable

61,828

07-Feb-2013

03:24

Not applicable

Report.ad.xml

Not applicable

24,821

07-Feb-2013

03:28

Not applicable

Rules.ad.xml

Not applicable

8,168

07-Feb-2013

03:24

Not applicable

Ntdsctrs.ini

Not applicable

58,408

07-Feb-2013

05:20

Not applicable

Report.ad.xml

Not applicable

25,482

07-Feb-2013

05:24

Not applicable

Rules.ad.xml

Not applicable

8,284

07-Feb-2013

05:19

Not applicable

Ntdsctrs.ini

Not applicable

58,870

07-Feb-2013

07:28

Not applicable

Report.ad.xml

Not applicable

24,090

07-Feb-2013

07:30

Not applicable

Rules.ad.xml

Not applicable

8,177

07-Feb-2013

07:28

Not applicable

Ntdsctrs.ini

Not applicable

40,804

07-Feb-2013

03:24

Not applicable

Report.ad.xml

Not applicable

23,027

07-Feb-2013

03:29

Not applicable

Rules.ad.xml

Not applicable

8,891

07-Feb-2013

03:24

Not applicable

Ntdsctrs.ini

Not applicable

40,266

07-Feb-2013

06:27

Not applicable

Report.ad.xml

Not applicable

23,789

07-Feb-2013

06:29

Not applicable

Rules.ad.xml

Not applicable

8,293

07-Feb-2013

06:27

Not applicable

Ntdsctrs.ini

Not applicable

57,744

07-Feb-2013

05:21

Not applicable

Report.ad.xml

Not applicable

23,945

07-Feb-2013

05:24

Not applicable

Rules.ad.xml

Not applicable

7,444

07-Feb-2013

05:20

Not applicable

Ntdsctrs.ini

Not applicable

63,834

07-Feb-2013

06:28

Not applicable

Report.ad.xml

Not applicable

23,906

07-Feb-2013

06:31

Not applicable

Rules.ad.xml

Not applicable

7,839

07-Feb-2013

06:28

Not applicable

Ntdsctrs.ini

Not applicable

59,306

07-Feb-2013

06:11

Not applicable

Report.ad.xml

Not applicable

24,779

07-Feb-2013

06:13

Not applicable

Rules.ad.xml

Not applicable

8,332

07-Feb-2013

06:11

Not applicable

Ntdsctrs.ini

Not applicable

58,102

07-Feb-2013

05:45

Not applicable

Report.ad.xml

Not applicable

24,297

07-Feb-2013

05:47

Not applicable

Rules.ad.xml

Not applicable

7,825

07-Feb-2013

05:45

Not applicable

Ntdsctrs.ini

Not applicable

60,378

07-Feb-2013

05:44

Not applicable

Report.ad.xml

Not applicable

24,894

07-Feb-2013

05:46

Not applicable

Rules.ad.xml

Not applicable

8,080

07-Feb-2013

05:44

Not applicable

Ntdsctrs.ini

Not applicable

57,344

07-Feb-2013

06:16

Not applicable

Report.ad.xml

Not applicable

27,906

07-Feb-2013

06:18

Not applicable

Rules.ad.xml

Not applicable

10,526

07-Feb-2013

06:16

Not applicable

Ntdsctrs.ini

Not applicable

59,498

07-Feb-2013

06:22

Not applicable

Report.ad.xml

Not applicable

24,062

07-Feb-2013

06:24

Not applicable

Rules.ad.xml

Not applicable

7,623

07-Feb-2013

06:22

Not applicable

Ntdsctrs.ini

Not applicable

55,046

07-Feb-2013

06:55

Not applicable

Report.ad.xml

Not applicable

23,889

07-Feb-2013

06:58

Not applicable

Rules.ad.xml

Not applicable

7,635

07-Feb-2013

06:55

Not applicable

Ntdsctrs.ini

Not applicable

35,612

07-Feb-2013

05:48

Not applicable

Report.ad.xml

Not applicable

22,757

07-Feb-2013

05:50

Not applicable

Rules.ad.xml

Not applicable

7,036

07-Feb-2013

05:48

Not applicable

Ntdsctrs.ini

Not applicable

36,708

07-Feb-2013

07:01

Not applicable

Report.ad.xml

Not applicable

22,781

07-Feb-2013

07:03

Not applicable

Rules.ad.xml

Not applicable

7,059

07-Feb-2013

07:00

Not applicable

Ntdsctrs.ini

Not applicable

36,688

07-Feb-2013

05:19

Not applicable

Report.ad.xml

Not applicable

22,781

07-Feb-2013

05:23

Not applicable

Rules.ad.xml

Not applicable

7,059

07-Feb-2013

05:19

Not applicable

Ntdsa.mof

Not applicable

227,765

02-Jun-2012

14:31

Not applicable

Ntdsai.dll

6.2.9200.21020

3,275,264

19-Apr-2014

04:24

x64

Windows 7 and Windows Server 2008 R2 file information notes

  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 7 and for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Ntdsa.mof

Not applicable

227,765

05-Nov-2010

01:54

Not applicable

Ntdsai.dll

6.1.7601.22645

2,025,472

02-Apr-2014

02:18

x86

For all supported x64-based versions of Windows 7 and Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Ntdsctrs.ini

Not applicable

58,486

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

25,550

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

8,368

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

61,684

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

24,069

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

7,695

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

54,286

02-Apr-2014

02:33

Not applicable

Report.ad.xml

Not applicable

22,929

02-Apr-2014

02:34

Not applicable

Rules.ad.xml

Not applicable

7,255

02-Apr-2014

02:33

Not applicable

Ntdsctrs.ini

Not applicable

60,800

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

24,503

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

8,031

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

61,502

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

24,821

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

8,168

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

58,156

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

25,482

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

8,284

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

58,590

02-Apr-2014

04:17

Not applicable

Report.ad.xml

Not applicable

24,090

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

8,177

02-Apr-2014

04:20

Not applicable

Ntdsctrs.ini

Not applicable

40,580

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

23,027

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

8,891

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

40,034

02-Apr-2014

04:17

Not applicable

Report.ad.xml

Not applicable

23,790

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

8,293

02-Apr-2014

04:20

Not applicable

Ntdsctrs.ini

Not applicable

63,530

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

23,900

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

7,839

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

58,990

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

24,779

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

8,332

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

57,834

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

24,297

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

7,821

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

60,310

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

24,922

02-Apr-2014

03:56

Not applicable

Rules.ad.xml

Not applicable

8,115

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

57,258

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

27,906

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

10,526

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

59,230

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

24,062

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

7,623

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

54,780

02-Apr-2014

04:17

Not applicable

Report.ad.xml

Not applicable

23,889

02-Apr-2014

03:58

Not applicable

Rules.ad.xml

Not applicable

7,635

02-Apr-2014

04:20

Not applicable

Ntdsctrs.ini

Not applicable

34,782

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

22,757

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

7,024

02-Apr-2014

04:19

Not applicable

Ntdsctrs.ini

Not applicable

36,464

02-Apr-2014

04:16

Not applicable

Report.ad.xml

Not applicable

22,781

02-Apr-2014

03:57

Not applicable

Rules.ad.xml

Not applicable

7,059

02-Apr-2014

04:19

Not applicable

Ntdsa.mof

Not applicable

227,765

05-Nov-2010

01:54

Not applicable

Ntdsai.dll

6.1.7601.22645

2,753,024

02-Apr-2014

02:39

x64


Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information for Windows 8 and for Windows Server 2012

Additional files for all supported x64-based versions of Windows 8 and Windows Server 2012

File property

Value

File name

Amd64_08ec44fb79ed6a2f1ad258ce3104cb01_31bf3856ad364e35_6.2.9200.21020_none_a8127000c9cf5f28.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_0c7ecd14834209e0e8f8fecf3a9c31e6_31bf3856ad364e35_6.2.9200.21020_none_13d9bd90316f01d1.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_0d797fbbbecf44edf1ab6ab1b2384361_31bf3856ad364e35_6.2.9200.21020_none_4ae8d9a1aa634174.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_10feca830a0fbae496cc61c01cb16c53_31bf3856ad364e35_6.2.9200.21020_none_7c6d14d787c9c556.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_1e8b6a36b3bf5bc071eadc1d078bec0d_31bf3856ad364e35_6.2.9200.21020_none_dda99027deeaf2d1.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_218786013be490c298384ec30d624621_31bf3856ad364e35_6.2.9200.21020_none_1ae24f0a3238573e.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_266c4b91d44fcef95db609868b82f94e_31bf3856ad364e35_6.2.9200.21020_none_4e1197af8cd74b53.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_2e0ef301d1bb0830d73a4d8481e6b18c_31bf3856ad364e35_6.2.9200.21020_none_afffcd57946fe780.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_33b63153e5b1fe743488b98a893714bc_31bf3856ad364e35_6.2.9200.21020_none_b9bc05940e4eec32.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_4095ef73eeaa10e9fe92976c6c50141d_31bf3856ad364e35_6.2.9200.21020_none_5582f5ad61f7c2d8.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_56e3726c78c1694c41eeff591d4b4438_31bf3856ad364e35_6.2.9200.21020_none_874797ebf5d35b4e.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_58a2dee31e940d78c8699f238cbb9b6a_31bf3856ad364e35_6.2.9200.21020_none_d8c1a4024a7bc687.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_67cb80782f840b490ed5901f83a46fe0_31bf3856ad364e35_6.2.9200.21020_none_389cd6290ed4cfb2.manifest

File version

Not applicable

File size

716

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_6ec82844d301954ab0e8eb42b209025e_31bf3856ad364e35_6.2.9200.21020_none_cabd763208551585.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_86b2440ac66964f74b8a930bd21c5f7b_31bf3856ad364e35_6.2.9200.21020_none_69f122db163262a4.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_8d9bb0012a15907f8478a44be3f2c49d_31bf3856ad364e35_6.2.9200.21020_none_e70902614de4958a.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

Not applicable

File name

Amd64_8da9f04db8c2116f79c9355c6a0a8ae9_31bf3856ad364e35_6.2.9200.21020_none_6f197f577135fb19.manifest

File version

Not applicable

File size

728

Date (UTC)

19-Apr-2014

Time (UTC)

17:50

Platform

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More Information

For more information about this issue, click the following article numbers to view the articles in the Microsoft Knowledge Base:

314980 How to configure Active Directory diagnostic event logging in Windows Server 2003 and in Windows 2000 Server

951581 LDAP queries are executed more slowly than expected in the AD or LDS/ADAM directory service and Event ID 1644 may be logged For more information about the STATS control, see the following articles:

STATS control information

Example for how to use STATS control in LDP

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