Conferencing modalities no longer function in Lync Server 2010, Lync Server 2013, or Skype for Business Server 2015 after you install Security Bulletin MS16-065

This problem occurs because an information disclosure vulnerability exists in the Transport Layer Security protocol and the Secure Sockets Layer protocol (TLS/SSL) as they are implemented in the encryption component of the Microsoft .NET Framework. An attacker who successfully exploits this vulnerability can decrypt encrypted TLS/SSL traffic.

Here is the resolutions... 

Gulab Prasad

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