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lync client authenticate fail, encounter SIP_E_AUTH_NTLMMISMATCH

已有 1239 次阅读2013-3-21 11:56 |个人分类:voip|系统分类:IT技术|

Recently lync client(using NTML encryption algorithm ) register to SBA server, register fail.  But lync client (using NTML encryption algorithm) can register successfully to lync center server. 

After enable the logging and check the logs with Snooper, I saw SIP_E_AUTH_NTLMMISMATCH error reared itself:Finally I was able to revival what was the issue. 

After disabling the 128-bit requirement from Local policy, lync client was able to successfully authenticate with SBA Lync server


To solve the issue follow the steps below:

Login to lync server desktop.

Click Start / Run

Type  secpol.msc

Expand Local Policies

Select Security Options

Scroll Down and find the following policies:

Network security: Minimum session security for NTLM SSP based (including secure RPC) clients

Network security: Minimum session security for NTLM SSP based (including secure RPC) servers


Both disable Require 128-bit encryption

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