• When you open Citrix Receiver inside the Desktop VDA ICA Session, you don’t get the Login prompt even because you get an error while connecting to the Store which points to the NS LB VIP.
• You can see errorCode=65150 : An SSL connection to the server couldn't be established because the server's certificate was not trusted.
• Sometimes, you are able to launch desktops and applications from the client machine (end-point) however when you attempt to launch the applications/desktops from the same storefront URL within the VDA ICA session, the session will fail to launch and you won't even get the .ica file generated itself

Open a browser on the Desktop VDA ICA Session and navigate to Internal SF URL,  you will see that the certificate not trusted for Root CA and hence copy the CER file and install it under Root CA on the desktop VDA Machine :

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Problem Cause

This eventually leads to the following error:
•    ShowMessageBox TopMost=False title= message=Your apps are not available at this time.  Please try again in a few minutes or contact your help desk with this information: Cannot contact Delivery group.",""

This article is explaining the scenario when you receive the Storefront ErrorCode=65150 : An SSL connection to the server couldn't be established because the server's certificate was not trusted. while logging in via receiver and storefront