Após instalar o WSUS 3 SP2, você pode se deparar com o erro conforme abaixo;

 

TypeInitializationException: The type initializer for ‘Microsoft.UpdateServices.ServerSyncWebServices.ServerSync.ServerSyncProxy’ threw an exception. —> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send.
atMicrosoft.UpdateServices.Internal.ClassFactory.CreateInstance(Typetype, Object[] args)
atMicrosoft.UpdateServices.ServerSync.ServerSyncLib.GetWebServiceProxyInternal(UpdateServerConfigurationserverConfig, WebServiceCommunicationHelper webServiceHelper, Boolean useCompressionProxy)
atMicrosoft.UpdateServices.ServerSync.ServerSyncLib.GetWebServiceCompressionProxy(UpdateServerConfigurationserverConfig, WebServiceCommunicationHelper webServiceHelper)
atMicrosoft.UpdateServices.ServerSync.CatalogSyncAgentCore.RetrieveSubscriptionData()
atMicrosoft.UpdateServices.ServerSync.CatalogSyncAgentCore.ExecuteSyncProtocol(BooleanallowRedirect)

 

Solução: Instalar o KB http://support.microsoft.com/kb/2734608