Using Two-Factor Authentication
Lync Server 2013 does not provide support for any kind of two-factor authentication such as smart cards or security tokens. Instead, remote Lync clients provide NTLM credentials over the secure SSL channel during the initial sign-in, and then use a certificate created by the Lync Front End Servers for any subsequent sign-ins. The certificate is specific to the remote endpoint and is stored locally to expedite the sign-in process for future logins. This also means that any home user with Lync installed on a personal PC can enter her Active Directory credentials to sign in to Lync remotely.
Some organizations have security mandates that require two-factor authentication for any form of remote access, and Lync is ...
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