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[MS-NLMP]: NT LAN Manager (NTLM) Authentication Protocol

Specifies the NT LAN Manager (NTLM) Authentication Protocol, used in Windows for authentication between clients and servers. NTLM is used by application protocols to authenticate remote users and, optionally, to provide session security when requested by the application.

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Published Version

Date

Protocol Revision

Revision Class

Downloads

4/23/2024

36.0

Major

PDF | DOCX | Diff

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Previous Versions

Date

Protocol Revision

Revision Class

Downloads

4/29/2022

35.0

Major

PDF | DOCX | Errata | Diff

6/25/2021

34.0

Major

PDF | DOCX | Errata | Diff

4/7/2021

33.0

Major

PDF | DOCX | Diff

10/1/2020

32.0

Major

PDF | DOCX | Diff

9/23/2019

31.0

Major

PDF | DOCX | Errata | Diff

9/12/2018

30.0

Major

PDF | DOCX | Errata | Diff

12/1/2017

29.0

None

PDF | DOCX | Diff

9/15/2017

29.0

Major

PDF | DOCX | Diff

6/1/2017

28.0

None

PDF | DOCX | Diff

7/14/2016

28.0

Major

PDF | DOCX | Diff

10/16/2015

27.0

None

PDF | DOCX | Errata

6/30/2015

27.0

Major

PDF | DOCX

5/15/2014

26.0

None

PDF | DOCX

2/13/2014

26.0

Major

PDF | DOCX

11/14/2013

25.0

Major

PDF | DOCX

8/8/2013

24.0

Major

PDF | DOCX

1/31/2013

23.0

Major

10/25/2012

22.0

Major

7/12/2012

21.0

Major

3/30/2012

20.0

Major

12/16/2011

19.0

Major

9/23/2011

18.0

Major

6/17/2011

17.4

Minor

5/6/2011

17.3

None

3/25/2011

17.3

Minor

2/11/2011

17.2

Minor

1/7/2011

17.1

Minor

11/19/2010

17.0

Major

10/8/2010

16.2

None

8/27/2010

16.2

None

7/16/2010

16.2

None

6/4/2010

16.2

Minor

4/23/2010

16.1

Minor

3/12/2010

16.0

Major

1/29/2010

15.2

Minor

12/18/2009

15.1

Minor

11/6/2009

15.0

Major

9/25/2009

14.0

Major

8/14/2009

13.2

Minor

7/2/2009

13.1

Minor

5/22/2009

13.0

Major

4/10/2009

12.1

Minor

2/27/2009

12.0

Major

1/16/2009

11.0

Major

12/5/2008

10.0

Major

10/24/2008

9.0.1

Editorial

8/29/2008

9.0

Major

7/25/2008

8.0

Major

6/20/2008

7.0

Major

5/16/2008

6.0.3

Editorial

3/14/2008

6.0.2

Editorial

1/25/2008

6.0.1

Editorial

11/30/2007

6.0

Major

10/23/2007

5.0

Major

9/28/2007

4.0

Major

8/10/2007

3.0

Major

7/20/2007

2.0

Major

7/3/2007

1.0.1

Editorial

6/1/2007

1.0

Major

2/22/2007

0.01

New

Preview Versions

From time to time, Microsoft may publish a preview, or pre-release, version of an Open Specifications technical document for community review and feedback. To submit feedback for a preview version of a technical document, please follow any instructions specified for that document. If no instructions are indicated for the document, please provide feedback by using the Open Specification Forums.

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A preview version of this document may be available on the Windows Protocols - Preview Documents page. After the preview period, the most current version of the document is available on this page.

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  • Technical Documentation. Microsoft publishes Open Specifications documentation (“this documentation”) for protocols, file formats, data portability, computer languages, and standards support. Additionally, overview documents cover inter-protocol relationships and interactions.

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