The catalog was last synchronized successfully %1 or more days ago.

Details
Product: .NET Framework
Event ID: 10021
Source: Windows Server Update Services
Version: 2.0.50727
Symbolic Name: HealthCoreCatalogSyncYellow
Message: The catalog was last synchronized successfully %1 or more days ago.
   
Explanation
WSUS catalog synchronization depends on connectivity to the upstream server or Microsoft Update.
   
User Action
Old Catalog Synchronization

The last catalog synchronization happened some time ago or was never performed.

  1. This is a reminder to synchronize the server on a regular
    basis if the synchronization schedule is set to manual.
  2. Start WSUS 3.0: Click Start, click Administrative Tools, then click Microsoft Windows Server Update Services v3.0.
  3. Click Synchronization Results.
  4. In the Action pane, click Synchronize Now.

Verify

Look for the corresponding error event.

  1. Open a command window.
  2. Type cd <WSUSInstallDir>\Tools
  3. Type wsusutil checkhealth
  4. Type eventvwr
  5. Review the Application log for the most recent events from
    source Windows Server Update Services and event id 10020.

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