The identity in the service registration is reused to verify permissions for deregistration. If the service is in pending registration, cancels the pending registration. If the service is registered, sends a deregistration request; generates TOPIC_STATUS events containing a TopicUnsubscribed message for each subscribed topic, a TopicDeactivated message for each active topic and a TopicDeleted for each created topic; generates REQUEST_STATUS events containing a RequestFailure message for each pending incoming request; and generates a SERVICE_STATUS event containing a ServiceDeregistered message. All published events on topics created on this service will be ignored after this method returns.