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The table below lists requirements, such as client, cumulative updates, etc. that are required for using TLS 1.2.

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TLS 1.2 Requirements

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TLS 1.2	Required
Skype for Business On Premises SBA
WS2012R2 ASM
Valid with Clients: Lync 2013 (Skype for Business) Desktop Client, MSI and C2R, including Basic 15.0.5023.1000 and higher Skype for Business 2016 Desktop Client, MSI 16.0.4678.1000 and higher, including Basic Skype for Business 2016 Click to Run Require the April 2018 Updates: Monthly and Semi-Annual Targeted – 16.0.9126.2152 and higher Semi-Annual and Deferred Channel – 16.0.8431.2242 and higher
Cumulative Updates - Skype for Business - March 2018 or Higher
ASM Roll-up - June 2018. Apply the Security Template after applying the ASM RollUp.
Before enabling TLS 1.2 Only on SBA, prepare the Skype for Business environment. Refer to: https://blogs.technet.microsoft.com/nexthop/2018/04/18/disabling-tls-1-01-1-in-skype-for-business-server-2015-part-1

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