servicebus token provider 401:The security token service cannot translate sid associated to user

Hi:

     this is my code used to connected to servicebus 1.1 for windows server:

          string connectstring="Endpoint=sb://uspnsvulm132.americas.hpqcorp.net/EntityManagerTest;StsEndpoint=https://uspnsvulm132.americas.hpqcorp.net:9355/EntityManagerTest;RuntimePort=9354;ManagementPort=9355"

            namespaceManager = NamespaceManager.CreateFromConnectionString(connectstring);                                   
            messagingFactory = MessagingFactory.CreateFromConnectionString(connectstring);

  this code block can work well yesterday,but today it throw below error:

Token provider returned message: '<Error><Code>401</Code><Detail>The security token service cannot translate sid 'S-1-5-21-1343024091-879983540-725345543-1794265' associated to user 'ASIAPACIFIC\zuoju'..TrackingId:3d1cba51-cb37-406b-807c-2aee097e2aba_Guspnsvulm132,TimeStamp:2/28/2014 3:26:39 AM</Detail></Error>'.

I already run powershell script ,verify that sid  'S-1-5-21-1343024091-879983540-725345543-1794265' is actually associated to 'ASIAPACIFIC\zuoju'.

So I wonder why this code block can't work, Could someone give me some help? thanks