Set NTLM authentication as first choice in lync 2010/2013 server

ISSUE: How to set authentication support NTLM in lync 2010/2013 server as first choice ?


SOLUTION:


Step 1. Run secpol.msc on Lync Front End server

Step 2. Select Local Policies  -> Security Options

Step 3. Open Network Security: Minimum session security for NTLM SSP based (including secure RPC)

Step 4. Tick on Require NTLMv2 session security (default Require 128-bit encryption)

Step 5.  Open second Network Security: Minimum session security for NTLM SSP based (including secure RPC)

Step 6. Tick on Require NTLMv2 session security (default Require 128-bit encryption)


You are done!