Getting prompted by the Citrix Receiver client to authenticate and to enter user name and password. It does not happen when the laptop is connected to the internal network. Only happens over VPN.

Put in the following registry keys: 

a) HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\Dazzle: Set 
InitialRefreshMaxMs, InitialRefreshMinMs and RefreshMs to REG_SZ Value 0; 
b) Add HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\Dazzle: Set 
SelfServiceFlags to REG_DWORD Value 0x1. 
c) HKEY_LOCAL_MACHINE\Software\Wow6432Node\Citrix\Dazzle\ 
EnablePreLaunch = false 
d) HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\ICA Client\Prelaunch 
State = 0 
e) HKLM\software/Wow6432Node\citrix\Dazzle 
Key: DisableCacheOfResourceList 
Type: Reg_SZ 
Value: True 

Also put in the following policy:
a) Disable Remove apps on Logoff and remove apps on exit using policies. 
 

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Problem Cause

The locally cached xml list for the user resources get outdated and require re-authentication to update.

Citrix Receiver keeps prompting for authentication when accessed remotely