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Event ID: 33005 Source: OCSIMMCU

Office Communications Server IM MCU Service could not be started.

Message: TLS cert issuer is empty
Stack:    at Microsoft.LiveServer.ImMcu.Config.OnWmiRoutingSettingEvent(WmiConsumerEventType eventType PropertyDataCollection properties)
   at Microsoft.LiveServer.ImMcu.Config.WmiConsumerSink(String className WmiConsumerEventType eventType ManagementBaseObject targetInstance ManagementBaseObject previousInstance IDictionary propertyChangeFlags)
   at Microsoft.Rtc.Internal.Wmi.WmiConsumer.GetInitialSettings(WmiConsumerClassEntry entry)
   at Microsoft.Rtc.Internal.Wmi.WmiConsumer.Start()
   at Microsoft.LiveServer.ImMcu.Config.InitializeWmiConsumer()
   at Microsoft.LiveServer.ImMcu.Config..ctor()
   at Microsoft.LiveServer.ImMcu.ConferenceManager..ctor()
   at Microsoft.LiveServer.ImMcu.ImMcuService.CreateConferenceManager()
   at Microsoft.Rtc.Server.McuInfrastructure.RetryLogicHandler`1.ExecuteMethod(RetryableMethodDelegate retryableMethod TimeSpan retryPeriod TimeSpan maxDuration)
   at Microsoft.LiveServer.ImMcu.ImMcuService.OnStart(String[] args)

Cause: Startup errors.
Check the events prior to this to resolve the service startup issue.
Check the certificate installed on this server. It is possible that the certificate is not valid or it is expired.

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