Hello Everyone, my name is Moni and I am a Support Engineer in the Windows Devices and Deployment team here at Microsoft. In this post, I’ll be discussing an issue where the Server Cleanup Wizard for WSUS 3.0 Service Pack 2 times out when attempting to delete computers that have not contacted the server in 30 days or more.
Details of the error are as follows:
The WSUS administration console was unable to connect to the WSUS Server Database.Verify that SQL server is running on the WSUS Server. If the problem persists, try restarting SQL.System.Data.SqlClient.SqlException — Access to table dbo.tbDownstreamServerClientSummaryRollup is blocked because the signature is not valid.Source.Net SqlClient Data ProviderStack Trace:at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)at Microsoft.UpdateServices.UI.SnapIn.Wizards.ServerCleanup.ServerCleanupWizard.OnCleanupComplete(Object sender, PerformCleanupCompletedEventArgs e) 

Source : SUS Blog
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