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Event ID: 25017 Source: OCSMediationServer

The A/V Authentication Service cannot be contacted. Connections that require Firewall traversal will not be successful.

Exception: Microsoft.Rtc.Signaling.RealTimeException: Transport error occurred while sending. ---> Microsoft.Rtc.Internal.Sip.SipException: Connection is closed
   at Microsoft.Rtc.Internal.Sip.RoutingModule.ProcessOutgoing(SipMessage message SipWorkitemQueue& queue SipWorkitem& workitem)
   at Microsoft.Rtc.Internal.Sip.MessageProcessingController.ProcessOutgoingMessage(SipMessage message)
   at Microsoft.Rtc.Internal.Sip.MessageProcessingController.ProcessMessage(SipMessage message)
   --- End of inner exception stack trace ---
   at Microsoft.Rtc.Signaling.SipAsyncResult.ThrowIfFailed()
   at Microsoft.Rtc.Signaling.Helper.EndAsyncOperation[T](Object owner IAsyncResult asyncResult)
   at Microsoft.Rtc.Signaling.RealTimeEndpoint.EndSendMessage(IAsyncResult asyncResult)
   at Microsoft.RTC.MediationServerCore.MrasCommunicator.SendMessageCallback(IAsyncResult result)

Cause: Either the A/V Authentication Service or Office Communications Server is not unreachable.
Verify that A/V Authentication Service is reachable from the computer running Office Communications Server.
No information available. If you have additional details about this event, please, send them to us!

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