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How do I enable or disable "Network security: Minimum session security for NTLM SSP based (including secure RPC) clients and serve" in windows 7

Posted on 2011-02-11
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Last Modified: 2012-05-11
An external lync user not able to connect to server.
On FrontEnd Server i got an error in event viewer telling: User authentication with NTLM protocol failed with error SEC_E_UNSUPPORTED_FUNCTION. This indicates a potential mismatch between security policy settings on the client and server computers.

Cause: This error can occur if the settings in "Network security: Minimum session security for NTLM SSP based (including secure RPC) clients" policy on the client computer are not the same as the settings in the "Network security: Minimum session security for NTLM SSP based (including secure RPC) servers" policy on this server.  By default, the "Require 128-bit encryption" setting is disabled for computers running Windows Server 2008, Windows Vista, Windows Server 2003, Windows 2000 Server, or Windows XP. For computers running Windows 7 or Windows Server 2008 R2, this setting enabled by default.
Resolution:
Ensure that the "Network security: Minimum session security for NTLM SSP based (including secure RPC) clients" policy settings on the computers from which users log on are the same as "Network security: Minimum session security for NTLM SSP based (including secure RPC) servers" policy settings on this server.
So i need to change the "Network security: Minimum session security for NTLM SSP based (including secure RPC) clients and serve" on the user machine wich is windows 7
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Question by:m1itsupport
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Accepted Solution

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m1itsupport earned 0 total points
ID: 34870487
Got it
it's in Local Computer Policy > Computer Configuration > Windows Settings > Security Settings > Security Options
i'll check if my problem solved
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Expert Comment

by:jonmck_denver
ID: 34878947
I wrote a blog post on this

https://www.t2mdev.com/jonmck/Lists/Posts/Post.aspx?ID=19

-jonmck
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Author Comment

by:m1itsupport
ID: 34913840
Problem Solved
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Author Closing Comment

by:m1itsupport
ID: 34941475
i got it
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