Troubleshooting

Lync Log File Locations
Lync client and server log file locations.

Lync Windows Client Logs 
Lync 2013: %userprofile%\AppData\Local\Microsoft\Office\15.0\Lync\Tracing
Lync 2010: %userprofile%\tracing

Log File: Lync-UccApi-#.UccApilog

Lync Web App Logs 
Add ?sl=1&log=full to the end of your meet url to enable detailed logging
e.g. https://meet.lync.co.nz/andrew/asea234ds?sl=1&log=full

Log location: %userprofile%\AppData\Local\Microsoft\LWAPlugin\Tracing and look for a file name
Log file name: LWAJSPersistent#.log

Lync Server Logs
Lync 2010/2013 tracing - C:\Windows\Tracing

Address Book URL's
Make sure that you can browse to the following URL's. You should receive an authentication challenge.

https://<internal or external web services URL>/abs/handler
https://<internal or external web services URL>/abs/handler/GroupExpansion/Service.svc

Lyncdiscover URL
https://lyncweb.domain.com/Autodiscover/AutodiscoverService.svc/root

Mobility MCX Service URL
https://lyncweb.domain.com/mcx/mcxservice.svc/mex

Web Apps
Service URL - https://ExternalWAC.domain.com/hosting/discovery

Edge Replication Service
https://<Edge Internal>:4443/ReplicationWebService

Lync Troubleshooting Tools
This is a collection of tools that I regularly use when troubleshooting a Lync client or server issue.

• Transport Reliability IP Probe
• Speed Test
• Remote Connectivity Analyser
• Lync Downloads List
• Lync Monitoring Server Reports
• Remote UC Troubleshooting (RUCT) - SRV record, certificate retrieval, Federation and connectivity testing
• PortQuery (config for Lync)
• Lync Synthetic Transaction cmdlets (Test-CS*)
• Telnet (I will put together a list of server/ports to test)
• Lync troubleshooting tools by James Cussen
• Lync ICE Warning Flag Decoder
• Wireshark - Getting Started | Decrypt Lync Communications
• Microsoft Network Monitor (traffic sniffer) 
• Fiddler (http / https traffic analyzer) 
• Lync Server 2010, Stress and Performance Tool
• Lync Resource Kit 2010 | 2013
• Snooper 2010 - uccp client and server log parser
• dbanalyze (used for querying SQL backend, to get pool, user and conference information)
• Lync Server 2013 Debugging Tools
• Snooper 2013 - uccp client and server log parser
• OCSLogger (included with Lync 2010)
• OCSTracer (included with Lync 2010)
• Server Event Logs (you knew that already though!)
 

Thanks to the LinkedIn community for expanding on this list. When time permits I will elaborate further on all the troubleshooting tools mentioned.