Article ID: 936555 - View products that this article applies to.
When you upgrade a Microsoft Windows Server Update Services (WSUS) server hierarchy to WSUS 3.0 from the top down, you must run the IISReset utility on the upstream server (USS) after you run the cleanup wizard. IISReset refreshes the Web cache to make sure that downstream servers can continue to synchronize from the upstream server.
In the following scenario, a failed synchronization may occur on a downstream server that is not yet upgraded to WSUS 3.0:
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