DotNet agent down (4352948)

DotNet AGENT becomes down with a following error when activating.

ERROR
YYYY-MM-DD HH:MIN:SEC ECHO    <DotNET/5.9.1/DotNET/DotNET_LocalHost@agent-name> ERROR [WatcherExecutor_2013.06.06-125931[1]-3] com.quest.dotnet.agent.collector.IISDiscovery3 - An unexpected error occurred which may cause undesired behavior. You may want to contact customer support if you see this error again: IISCacheUpdater{IIS}Reason unknown
com.jaco
YYYY-MM-DD HH:MIN:SEC ECHO    <DotNET/5.9.1/DotNET/DotNET_LocalHost@agent-name> INFO [Quartz[0]-1] com.quest.dotnet.agent.collector.performancecounter.AppPoolCollector - Problem getting counter APP_POOL_WAS|Current Application Pool State|AuthorityEService from .; reason: Category does not exist.
YYYY-MM-DD HH:MIN:SEC ECHO    <DotNET/5.9.1/DotNET/DotNET_LocalHost@agent-name> INFO [Quartz[0]-1] com.quest.dotnet.agent.collector.com.AgentTraceEvent -    at Quest.DotNet.Collector.PerfCounterHelper.getInstanceDataColFromCategoryInstanceDataColCol(String counterName, InstanceDataCollectionCollection idColCol)
   at Quest.DotNet.Collector.PerfCounterHelper.getProcessNameByIdUsingCategoryInstanceData(Int32 id, String hostname, String categoryName, String counterName)