Problem
Users have complained that they no longer see published apps and desktops after successfully logging onto Citrix as they only see the message:
There are no apps or desktops available to you at this time.
Reviewing the Citrix Delivery Services event logs on the Citrix StoreFront server displays the following errors:
None of the Citrix XML Services configured for farm Controller are in the list of active services, so none were contacted.
Log Name: Citrix Delivery Services
Source: Citrix Store Service
Event ID: 4012
Level: Error
Failed to launch the resource ‘Controller.GP’ as it was not found.
Log Name: Citrix Delivery Services
Source: Citrix Store Service
Event ID: 28
Level: Warning
None of the Citrix XML Services configured for farm Controller are in the list of active services, so none were contacted.
Log Name: Citrix Delivery Services
Source: Citrix Store Service
Event ID: 4012
Level: Error
Solution
The most important entry in the event logs written for this issue could easily be missed because the entry that provides the cause of the issue is actually labeled as Information. Continuing to move to earlier logs will reveal the following entry indicating that the SSL certificate on the Delivery Controller has expired:
The Citrix XML Service at address svr-ctxdc-02.ccs.int:443 has failed the background health check and has been temporarily removed from the list of active services. Failure details: An SSL connection could not be established: The server sent an expired security certificate. The certificate *.ccs.int, *.ccs.int is valid from 10/29/2018 9:37:20 AM until 10/28/2020 9:37:20 AM.. This message was reported from the Citrix XML Service at address https://svr-ctxdc-02.ccs.int/scripts/wpnbr.dll[UnknownRequest].
You would not be able to see this entry if you are reviewing the logs in the Administrative Events, which does not display Information entries.
To correct the issue, simply issue a new SSL certificate to replace the expired certificate on the Delivery Controller (or controllers if there are more than one), then update the bindings in IIS Manager:
Successfully updating the SSL certificate will re-establish communication between the StoreFront server and the Delivery Controller(s).
