Lync Server Logging Tool
When all else fails and the problem cannot be diagnosed, perform a diagnostic trace of the server traffic. Included with the installation of any Lync Server role is the Lync Server Logging Tool. This application can be found within the Start menu under the Microsoft Lync Server 2010 program group. This tool is valuable when troubleshooting Lync Server problems because it provides insight into what is happening at the protocol level.
The most common type of tracing done with this tool is to capture the SIP traffic between servers or clients to determine a potential problem. Other traditional types of tracing tools, such as Wireshark, are unable to analyze the Lync Server SIP traffic because it is encrypted using TLS security. ...
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