2407161 - Launchpad or application fails to load with the error "Our service is not available at the moment"

Symptom

Fiori Launchpad or a legacy app (Web Dynpro or SAP GUI for HTML/WebGUI, and even SAP GUI for Windows) fails to load with the error:

Unser Service ist zurzeit leider nicht verfuegbar. Bitte versuchen Sie es spaeter noch einmal.
Wir entschuldigen uns für Unannehmlichkeiten

Our service is not available at the moment. Please try again later. 
We apologize for the trouble caused.

Environment

SAP Fiori Launchpad
SAP Web Dispatcher
SAP HANA Enterprise Cloud
SAP HANA Cloud Platform

Product

SAP Business Technology Platform all versions ; SAP Fiori all versions

Keywords

HEC, HCP, NetWeaver, FLP, authpermfile, WDP, Our service is not available at the moment, PDF display, SAP GUI for Windows. , KBA , BC-CST-WDP , Web Dispatcher , CA-UI2-INT-FE , Please use CA-FLP-FE-COR , CA-UI2-INT-BE , Please use CA-FLP-ABA , CA-FLP-FE-COR , SAP Fiori Launchpad Frontend Core and Services , CA-FLP-FE-UI , SAP Fiori Launchpad User Interface , Problem

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