2378376 - Cannot logon to SAP (Fiori Launchpad, WebGUI, ...) through the SAP Web Dispatcher

When connecting to the Fiori Launchpad via the following:

https://<SAP web dispatcher host>:<SAP Web dispatcher HTTPS port>/sap/bc/ui2/flp

or

https://<SAP web dispatcher host>:<SAP Web dispatcher HTTPS port>/sap/bc/ui5_ui5/ui2/ushell/shells/abap/Fiorilaunchpad

or

https://<SAP web dispatcher host>:<SAP Web dispatcher HTTPS port>/sap/bc/gui/sap/its/webgui

After entering the correct credentials, the logon screen is presented again, and depending on configuration, the user may be prompted:

Error  "Logon through HTTP is not possible; logon ticket is active for HTTPS only" may occur

Another possible symptom is that the browser shows an error page with the message "too many redirects" (ERR_TOO_MANY_REDIRECTS).

• Operating System independent
• Database independent
• SAP NetWeaver based product
• ABAP Platform based product
• SAP Web Dispatcher

Fiori Launchpad connect, https://<SAP web dispatcher host>:<SAP Web dispatcher HTTPS port>/sap/bc/ui2/flp, credentials, logon screen, Error  "Logon through HTTP is not possible; logon ticket is active for HTTPS only" may occur, Web Dispatcher, ICF, SSL connection, encryption, re-encrypt, HTTP, back end system, HTTPS request, /sap/bc/ui2/flp, wdisp/ssl_encrypt, inbound HTTP request, end-to-end SSL, ROUTER, icm/server_port_<xx>, SICF , KBA , redirect , loop , BC-CST-WDP , Web Dispatcher , BC-CST , Client/Server Technology , CA-UI2-INT-BE , Please use CA-FLP-ABA , BC-MID-ICF-LGN , ICF System Login , Problem