Unavailable - the remote data source is dropped or stopped, or there are network problems between the data source and the federated server.
不可用——远程数据源被删除或停用，或者数据源与联邦服务器之间存在网络故障。
If your network become unavailable or the CALV message is otherwise not present, the focus designators may appear incorrectly.
如果网络变得不可用或者CALV消息没有显示，焦点指示器可能不会正确显示。
Hosts might be down, services might be temporarily unavailable and, in a very busy network, the scanning packets simply might not have gone through.
主机可能会关闭，某些服务可能暂时无法使用，并且在一个非常繁忙的网络中，扫描数据包可能根本无法通过。
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