站点里是否还有其他Software Update Point存在？是否有高一级的站点存在？只有最高一级的站点有一台Software Update Point可以和互联网上的服务器同步而其他的SUP都是跟这唯一一台SUP同步。
同时 如果站点是Native Mode，确保443端口已经开启。
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