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Microsoft® Lync® Server 2013 Unleashed Second Edition by Randy Wintle, Alex Lewis, David Ross, Tom Pacyk

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Planning for External Access to AD FS

External access to the federation service is granted by means of a federation server proxy. A federation server proxy acts as an intermediary proxy service between client systems on the Internet and a federation service that is located behind a firewall on the corporate network. To enable Lync Online users to log on using SSO from outside the corporate network, a minimum of one AD FS proxy server is needed. However, if remote access to Lync Online is considered critical to the organization, then more than one proxy must be installed, and connections to the proxy systems would be load balanced using either a hardware load balancer or the Microsoft NLB feature.

The federation server proxy system (or cluster, ...

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