I get the following error when trying to externally launch any application from the Web Interface "Applications" page - "Cannot connect to the Citrix Presentation Server. There is no Citrix Presentation Server configured on the specified address". But when I launch the same application internally it works OK. I am not using Citrix SG. I'm using MPS 4.0 (4 server farm) and Web Interface. Any assistance would be appreciated. Cathy