March 2013 Update: A fix for this issue is now available. See A Fix for the Lync 2010 Control Panel Crash Issue on VMWare for more information.
I have experienced an issue recently with the Lync Control Panel crashing on several Lync servers. It appears the problem is caused by a recent Silverlight 5 update, but may or may not surface on all Lync servers. The issue is being investigated, but in the meantime, if you are experiencing this issue there are two easy workarounds:
- Launch the Lync Control Panel from a web browser using the pool FQDN. This will take the form: https://<pool_FQDN>/CSCP. Don’t forget the “s” or a HTTP 403 forbidden will be returned.
- Uninstall Silverlight 5 and re-install Silverlight 4. You can download Version 4 of Silverlight here: http://go.microsoft.com/fwlink/?LinkID=149156&v=4.0.50826.0.
The issue manifests itself if you launch the Lync Control Panel from the Windows Programs menu which uses an IIS component called AdminUIHost.exe. After a period of between 0 and 5 minutes, you will get the following error:
The culprit appears to be a recent Silverlight 5.1.10411.0 update (combined with using the AdminUIHost.exe component):
June 25, 2012 Update
Microsoft is aware of this issue. It appears to be a Silverlight 5 issue when running on VMWare (version unknown). There is no ETA on a fix and the recommended solution for now is to rollback to Silverlight 4.x.
Here is a thread on a VMWare forum that discusses the Silverlight 5 issue: http://communities.vmware.com/message/2005873.