I came across an issue where a fresh install of the Lync Connectivity Analyzer ( http://technet.microsoft.com/en-us/library/jj907302.aspx ) on Server 2012 wouldn’t launch. Looking in the Event Viewer I found the following errors.

Event: ID 1026
Source .Net Runtime
Application: LyncConnectivityAnalyzer.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.InvalidOperationException

Event: ID 1000
Source: Application Error
Faulting application name: LyncConnectivityAnalyzer.exe, version: 5.0.8308.289, time stamp: 0x5113842c
Faulting module name: KERNELBASE.dll, version: 6.2.9200.16451, time stamp: 0x50988aa6
Exception code: 0xe0434352

I tried the Lync Connectivity Analyzer on my Windows 8 desktop (known to be working) and had the same issue.

System Requirements for the Lync Connectivity Analyzer

• Windows 7 Service Pack 1, Windows 8, Windows Server 2008 R2 SP1, Windows Server 2008 Service Pack 2, Windows Server 2012, Windows Vista Service Pack 2
• Microsoft .NET Framework 4.5

This led me to believe a patch for .NET 4.5 might be the cause. After removing the July patches KB2840632 & KB2833958, I was able to launch the Analyzer again. Another user reported that just removing KB2840632 will resolve the issue.

Details of the KB2840632 Security Update: http://support.microsoft.com/kb/2840632

Updated Lync Connectivity Analyzer: http://blogs.technet.com/b/nexthop/archive/2014/01/21/announcing-the-release-of-the-updated-lync-connectivity-analyzer.aspx