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WSUS Console - Error: Connection Error

I faced the following problem at a cusotmer, When i opened the WSUS console i get the following message:

and the following error in the event viewer:
Log Name: Application


Source: Windows Server Update Services

Date: 2/12/2012 3:16:29 PM

Event ID: 7053

Task Category: None

Level: Error

Keywords: Classic

User: N/A

Computer:
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
Solution:
after investigation i found out that the Windows Internal Database service was not running, starting it fixed the problem immediately.


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