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Event ID: 7053 Source: WindowsServerUpdateServices

Level
Description
The WSUS administration console has encountered an unexpected error. This may be a transient error; try restarting the administration console. If this error persists, Try removing the persisted preferences for the console by deleting the wsus file under %appdata%\Microsoft\MMC\.

System.NullReferenceException -- Object reference not set to an instance of an object.

Source
Microsoft.UpdateServices.UI.SnapIn

Stack Trace:
    at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.GetUpdateServer(PersistedServerSettings
settings)
    at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ConnectToServer()
    at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.ConnectToServerAndPopulateNode(Boolean
connectingServerToConsole)
    at
Microsoft.UpdateServices.UI.SnapIn.Scope.ServerSummaryScopeNode.OnExpand(AsyncStatus
status).
Comments
 
This event can be recorded in various conditions, depending on the type of problem encountered by the WSUS administration console. The actual error message is listed after the "The WSUS administration console ... by deleting the wsus file under %appdata%\Microsoft\MMC\." For the example above, this would be:

System.NullReferenceException -- Object reference not set to an instance of an object.

This is a typical programming error, when an "object" is not properly initiated, yet the program attempts to use it. See EV100321 (Why do I get the error "Object reference not set to an instance of an object"?) for some details. The "stack trace" show where in the code was this error triggered. There is not much an administrator can do to fix this, short of applying the latest software updates (but if that condition was not fixed then it will not help). However, the administrator may be able to determine in what conditions this happens and avoid them until the problem if fixed.
Reinstalling WSUS while preserving the previous settings fixed this problem for us.
T708630 (Issues with the WSUS 3.0 Administration Console) contains a list of troubleshooting suggestions related to the WSUS 3.0 Administration Console. About this particular error it says that is probably due to the WWW Publishing service being configured to allow interaction with the desktop.

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