| Event Information | According to Microsoft : CAUSE: This event occurs when the service application list cannot be synchronized with the instance's application list stored in the database. The NS$ service periodically synchronizes its list of known applications with the official list of applications that is stored in the instance database. This event is logged when that synchronization cannot be performed. The application list is synchronized every minute, so this event is self-correcting if the application list is synchronized on the next try. If the synchronization fails repeatedly, the service application list remains out of sync with that of the instance and so the instance does not function properly. This synchronization problem is usually caused by the instance database being unavailable. The computer that hosts the database may be stopped, unreachable, or under heavy load. The event log entry contains details on the cause of the error.
RESOLUTION: Be sure to investigate the explanation provided in the event log entry, because the cause of this error is also likely to cause other database connectivity issues that will affect the entire instance. Restarting SQL Server or the NS$ service may resolve the issue.
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