Start Topology Builder: Click Start, click All Programs, click Microsoft Lync Server 2013, and then click Lync Server Topology Builder.

In Topology Builder, in the console tree under Standard Edition Front Ends, Enterprise Edition Front Ends, and Directors, right-click the pool name that you need to edit, and then click Edit Properties.

In the Web services section, add or edit the External web services FQDN.

Review and adjust the Listening ports for both HTTP and HTTPS. The defaults will be:

• Listening ports: HTTP 8080, HTTPS 4443

• Published ports: HTTP 80, HTTPS 443

Where the Listening ports is the port that the external web services will be configured to receive requests from the reverse proxy, and the Published ports is the ports that are published externally by the reverse proxy and is communicated to clients during in-band provisioning.

When you have completed your additions and updates, click OK to continue.

Right-click Lync Server 2013, and then click Publish.

Important:
After publishing successfully completes, a link may be presented that informs you that there are additional steps that need to be taken. The link, if clicked, opens a list of servers affected by the changes made in Topology Builder that will require you to re-run the Lync Server Deployment Wizard on each listed server to update the configuration for added, removed, or changed components.

Repeat these steps for each Standard Edition server, Front End pool, Director or Director pool in the organization.