Solution : https://service.sap.com/sap/support/notes/893272 (SAP Service marketplace login required)
Key words :
set rsadmin parameter no_different_filenames_for_dl = inline, terms ms internet explorer, ms internet explorer asks, ms internet explorer carries, ms internet explorer stores, ms internet explorer, microsoft internet explorer, download manager running, tcp connection ends, maximum processing time
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824554 | ICM and SAP Web Dispatcher Timeout Parameter |
777991 | Dialog box appears w/ download to Excel/CSV after SP import |