Web Services Ports

When configuring the internal and external web services for a Director, options exist to define the listening ports and the published ports. The differences between the two are outlined here:

• Listening ports—Ports that the IIS services bind to on the Lync Server.

• Published ports—Ports used by clients to access the services. These ports might be redirected by a load balancer, reverse proxy, or firewall to the listening port on a server.

In a default installation, the internal web services are listening and published on ports 80 and 443. However, because the external web services use a separate IIS site, they need to run on alternate ports so that they do not conflict with the internal web services. In a default scenario, the external web services run on port 8080 for HTTP and 4443 for HTTPS. Figure 9.8 shows how the different IIS port bindings are used for external and internal traffic.

Figure 9.8 Listening and Published Ports for Web Services