Microsoft® Lync® Server 2013 Unleashed Second Edition

Firewall Ports

Connectivity to an Edge Server or reverse proxy can be limited by firewalls and can be tricky to troubleshoot because the connections generally cross a few network boundaries. See Chapter 12, “Firewall and Security Requirements.” Check firewalls between remote clients, Edge Servers, and internal servers. Also, check whether the Windows Firewall is blocking connections.