Event ID 14614: 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.


How to Enable Users for Lync 2013

Login to the Lync URL

https://Lync.abc.com/Cscp/

Single sign on will work for this

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Click on Enable Users for Lync Server.

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Click Add to add the user for enabling it.

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Type the user logon name in search field and click find, select the required user and click ok.

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Select pool server from the drop down from Pool list.

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Select Enterprise Voice from the Telephony drop down list.

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Click on the Enable to enable the user for lync.