Network-Based Firewalls
Most implementations of Lync Server involve some form of a network-based firewall, usually in the DMZ (Demilitarized Zone). The purpose of this device is to ensure that only the necessary services on the Lync Server systems are made available externally. Although an administrator might want external users to reach an Edge Server on port 443 for a web-based client, it is probably not desirable for users on the Internet to be able to map a drive to the Edge Server on port 445.
To maximize security, it is fairly common to configure the external services of Lync Server so that not only is there a firewall between the Internet and the Lync Server servers, but that there is also a firewall between the internal network and the ...
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