There are no apps and desktops available to you at this time [Incomplete DDC Certificate Update]

Storefront: There are no apps and desktops available to you at this time - Event logs ID: 4012: None of the Citrix XML Services configured for farm are in the list of active services, so none were contacted...

Citrix XML Services Configured for Farm Controller Fails to Respond to XML Service Transaction

Citrix XML Services configured for farm Controller fails to respond to XML Service transaction after installing Microsoft KB2919355 on Controllers. Uninstalling the patch KB2919355 on Windows 2012 R2 Controller resolves this issue...