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Typically, the top-level site in your hierarchy is configured to synchronize software updates metadata with Microsoft Update. When your corporate security policy does not allow access to the Internet from the top-level site, you can configure the synchronization source for the top-level site to use an existing WSUS server that is not in your Configuration Manager hierarchy. For example, you might have a WSUS server installed in your DMZ that has Internet access, but your top-level site does not. You can configure the WSUS server in the DMZ as your synchronization source for software updates metadata. You must ensure that the WSUS server in the DMZ synchronizes software updates that meet the criteria that you need in your Configuration Manager hierarchy. Otherwise, the top-level site might not synchronize the software updates that you expect. When you install the software update point, configure a WSUS connection account that has access to the WSUS server in the DMZ and confirm that the firewall permits traffic for the appropriate ports. For more information about the ports that are used by the software update point to the synchronization source, see the Software Update Point -- > Upstream WSUS Server section in the Technical Reference for Ports Used in Configuration Manager topic.
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