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Event ID: 10021 Source: WindowsServerUpdateServices

The catalog was last synchronized successfully <value> or more days ago.
As per Microsoft: "WSUS catalog synchronization depends on connectivity to the upstream server or Microsoft Update. The last catalog synchronization happened some time ago or was never performed". See "Microsoft event 10021 from source Windows Server Update Services" for additional information on this event.

Also from Microsoft: "If your last catalog synchronization failed and you see event ID 10021 or 10022, check your upstream server and proxy settings in the WSUS administration console (Options, then Update Source and Proxy Server)". See the link to "WSUS - Issues with Synchronization" for more details.

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