Solution : https://service.sap.com/sap/support/notes/634262 (SAP Service marketplace login required)
Key words :
'show friendly http error messages', kill -usr2/-usr1 <pid> windows, detailed network plan/infrastructure plan, sapntkill -usr2/-usr1 <pid>, relevant back-end system, external binding program icmbnd, java back-end system, sapwebdisp pf=<profile> -checkconfig, dev_webdisp_watchdog dev_icmbnd solution check, sap support check list
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