Investigate how to (possibly automatically) re-initialize a URLConnection after it is "stalled" for some period of time.
Currently our code in DownloadWindow.java updates the the progress every 1.5 seconds, and considers it "stalled" if the last 10 such updates (15 seconds) contained no additional content downloaded.
An alternative for such a new RFE would be to give the user a "Retry" button in the GUI when it reaches the "stalled' state.
 
See also: RFE 4398084: Resume downloads of partially downloaded Javaws applications / JPI applets.