Wireshark is an open source (GNU) tool used to capture and analyze network traffic. It is often used to troubleshoot Lync issues or to deep dive into the network traffic related to a specific feature. In addition to this, Wireshark adds to the standard debugging tools the capability to decrypt SSL/TLS traffic. It is really important for issues related to the Lync web services. We will see some hints related to installing and using it.
Wireshark is available for download at https://www.wireshark.org/. We will use the latest stable release, 1.12.0, on our Lync Front End (installed on Windows Server 2012 R2) by downloading the matching Windows installer (64 bit)