2477176 - Opening WebDynpro applications from Fiori Launchpad gives 503 - Service not available

Symptom

Fiori Launchpad has been set up with tiles that are pointing to Web Dynpro applications. These applications are invoked from remote systems.
The navigation intent gets resolved, but results in blank page and HTTP error 503 Service Not Available - No System Found or 503 Service not available or as shown in the following screenshot:

Environment

SAP NetWeaver
Fiori Launchpad

Product

SAP NetWeaver 7.4 ; SAP NetWeaver 7.5

Keywords

Fiori Launchpad; 503; service not available; system alias; SM59; WebDynpro , KBA , CA-FLP-ABA , SAP Fiori Launchpad ABAP Services , CA-FE-FLP-EU , Please use CA-FLP-FE-UI , Problem

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