Cloud Connectivity Test returns "unable to validate connectivity [...] The following services are not responding: Broker Service"
The Citrix High Availability Service is not running, and when started manually it crashes.
Application error in event logs:
Faulting module name KERNELBASE.dll [...] Exception code: 0xe0434352
Error details Cannot load Counter Name data because an invalid index 'WorkflowServiceHost 4.0.0.0' was read from the registry.' 

 

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Rebuild windows perfromance counters on the connectors as per https://docs.microsoft.com/en-us/troubleshoot/windows-server/performance/manually-rebuild-performance-counters

To do this:

1. Open a command prompt and run the commands below
   1.  cd c:\windows\system32
   2. lodctr /R
   3. cd c:\windows\sysWOW64
   4. lodctr /R
   5. WINMGMT.EXE /RESYNCPERF
2. Stop and restart the Performance Logs and Alerts service.
3. Stop and restart the Windows Management Instrumentation service.
4. Start the Citrix High Availability Service.

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Problem Cause

Performance Counter corruption.