When a key service goes down on a server, you will usually hear about it from a user or another office such as the help desk when they begin receiving calls from users. It's also entirely possible that these services may have been down for a while and no one really noticed until they happened to access a specific resource or service from a server and realized that it was no longer available. Typically it is something like a service that is set to be an automated service, meaning that when a server is rebooted for something like an update, the services will automatically start back up while those which are set to manual or disabled will not start back up.
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