The Citrix WMI service is set to Manual by default in XenApp 6 Fundamentals but trying to start it manually fails with the error Event ID 7023:
“The Citrix WMI Service terminated with the following error: Access is denied.”

There might be a series of warnings with Event ID 3 on the Application log as shown in the following screen shot:
 

An event was logged for each of the Citrix WMI dll files listed in the subkeys of the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\WMIService\DLLs
 
The description reads:
“The license check for <name of dll> failed, it will therefore not be available until a valid license is provided.”
 
An examination of the license file shows that it is valid. The Licensing node in QuickStart console also shows that licensing was properly configured.
 

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To resolve this issue disable the Citrix WMI Service because it is not used.

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Problem Cause

This error occurs because Citrix WMI service is only used in Enterprise and Platinum Editions of XenApp and not used in XenApp Fundamentals.

This article provides resolution when the Citrix WMI service fails with Error event ID 7023: “The Citrix WMI Service terminated with the following error: Access is denied."

CTX127535 – Citrix XenApp 6.0 Fundamentals - Unsupported Features