After a failed upgrade for StoreFront 2.5 and while repairing StoreFront, Studio lost communication to the DDC.

[Details] 
Error Id: XDDS:F26A2921 
Exception: 
Citrix.Console.Common.CitrixAggregateException One or more parallel operations failed 
at Citrix.Console.Common.CitrixParallel.InternalForEach[TIn](IEnumerable`1 items, Action`1 operation, Int32 maxSimultaneous) 
at Citrix.Console.PowerShellSdk.SiteService.Scripts.LoaderScript.RunScript() 
at Citrix.Console.PowerShellInteraction.PowerShellScript`1.Run() 
at Citrix.Console.PowerShellSdk.SiteService.PSSiteService.LoadSiteState() 
at Citrix.Console.DeliveryCenter.UI.ViewModel.DesktopStudioViewModel.LoadSiteState() 
at Citrix.Console.DeliveryCenter.UI.ViewModel.DesktopStudioViewModel.ConnectToSite(String ccsLocation, Boolean safeForDispatcher) 
at Citrix.Console.CommonControls.ProgressDisplay.ProgressWindowOperation.PerformOperation() 
at Citrix.Console.CommonControls.ProgressDisplay.ProgressWindowViewModel.PerformAction(Action operationComplete)

Problem Cause

A corrupted upgrade installation might cause this error.