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

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Network and Security Considerations for Mobility

Given the requirements to direct all mobile users to the external web services through a reverse proxy, even for internal clients, a unique hairpin situation is created. In some environments, hair pinning is not allowed. This scenario can arise when the internal traffic is egressing an interface and attempting to immediately ingress on the same interface.

This functionality must be allowed for the Mobility Services to work. A potential workaround for this issue is to deploy the reverse proxy solution separately from the firewall (that is, do not allow RP traffic to traverse the corporate firewall to prevent issues with hair-pinning). In that configuration, the traffic will egress the reverse proxy ...

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