3151020 - Fiori (SAP GUI for HTML) transaction app options/settings not stored/saved

• SAP GUI for HTML (webgui) transaction app options/settings not been stored/saved permanently even though the system has already the correction of
  SAP Note 2923109 - SAP GUI for HTML: URL parameter are ignored or options/settings are not permanently stored.
• The resolution steps from the below documents doesn't work permanently:
  • 2433872 (WEBGUI: OK Code field is not visible)
  • 2723816 (WEBGUI: How to show keys in dropdown/combobox elements)
  • 2948874 (Webgui FSM: default file encoding set to ANSI for unicode systems)
  • 3192844 (WEBGUI: How to set messages to be displayed in a popup?)
  • 3217534 (Support for FIORI-like valuehelp added)
  • 3354380 (WEBGUI: How to create an UR performance trace)
  • 3281713 (How to change file encoding in WebGUI)
  • 2818487 (Enable altering the touch mode)
  • 3274616 (Switching on/off the mobile rendering setting is not permanent)
  • 3425327 (Improving mobile setting)
          
• The Console tab in the browser's F12 Developer Tool contains this error:
   → WebSocket connection to 'wss://<host.domain>:<port>/sap/bc/apc/sap/webgui_services?window_id=...' failed

• ITS and SAP GUI for HTML
• New ABAP handler CL_HTTP_EXT_ITS_2
• SAP NetWeaver with SAP Kernel 753 (1709) and higher
• SAP S/4HANA, ABAP platform

SAP GUI for HTML, webgui, GUI Actions and Settings, Settings, Option, Options, New handler, SITSCLNTOPTS , CL_HTTP_EXT_ITS_2, wss:// , WSS , WebSocket has not readyState open, readyState is: 0, not saved permanently. , KBA , BC-FES-WGU , SAP GUI for HTML , BC-MID-AC , ABAP Channels , BC-FES-ITS , SAP Internet Transaction Server , How To