Web Interface 5.2 and Presentation Server 4.0

Error message ”Citrix online plug-in could not contact the server” when trying to access applications with the Citrix XenApp plug-in.

Recently I helped upgrading a WI to version 5.2. The customer was running Presentation Server 4.0. After the upgrade everything worked fine for all users running WI with the XenApp Web plug-in. A few users, no more than 20, was running the XenApp plug-in (The new name for the old PN agent). These users could not launch any applications 🙁

The application enumeration worked fine, but trying to launch an app would show the error ”Citrix online plug-in could not contact the server”.

After some troubleshooting I found the following solution:

Edit the WebInterface.conf file.

Change the value RequireLaunchReference=On to RequireLaunchReference=Off.

That solved the issue.

Afterwards I found this Citrix technote describing the necessity to change this value. Even though it’s not exactly the same issue: http://support.citrix.com/article/ctx123003

Jacob Berg


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